(a) Rectilinear propagation of light aberrations. Question 29. (c) Sun The term rain shadow is used to describe the place with the dominant wind direction, elevation and other factors that keeps the area dry.Image credit :Meg Stewart,CC BY-SA 2.0, via Wikimedia Commons. The formation of shadow of one celestial body on the other is known as (b) the movement of the light source The colour of the shadow is always black. In other words, a shadow of an object is a dark image formed by the obstruction of light caused by the object. This seeming left-right reversal is called lateral inversion. the light ray falling on the opaque object is blocked by it. What is the colour of the image formed by a plane mirror? This explains why we cannot see a shadow in the dark. Question 13. He was very upset. The difference between shadow and reflection is that a shadow is formed by the blocking of light rays by any object. In a plane mirror our left hand looks like right hand. (c) surface the contrast between the shadow and the surrounding area is much more and therefore, we can clearly see the shadow formation. Question 14. Reflection occurs mainly on the mirror surface as incident light gets reflected when it falls on a clear surface and due to reflection the image formed is always erect. Ask your friend to trace out the outline of the shadow on the screen. Objects that do not have light of their own are called __________ objects. (b) Why was Soumen unable to get the image of a well lit object? Question 3. (a) A thin glass sheet What are the essential conditions for formation of shadows? Plastic is opaque but glass is _________. (d) none of these, Question 30. (b) Glass (a) reflected ray The area in shadow appears black because there is no light falling on it. object. (d) Parthiv is an intelligent and mature boy with scientific aptitude. Let a beam of light pass through the comb on the mirror using a torch. Aim: To obtain a shadow and study its characteristics Materials needed: A torch, a few small opaque objects of different shapes and sizes and a white screen (a piece of cardboard covered with white paper). Answer: while tracing paper is . WebA shadow refers to a dark real silhouette of a person or an opaque object that is generated when the object or person obstructs the light coming from a light source. that allows you to see things is called as light. If an observer is placed in the antumbra region, then he/she can see an annular eclipse i.e. The formation of shadows by celestial bodies on one another is called an eclipse. Answer: Note: Umbra and penumbra are formed only when an opaque object is placed in front of an extended source of light. Why should we not look at the sun directly? Since May 2022, Now connect to a tutor anywhere from the web. (a) image During day time sunlight acts as a source of energy which makes everything visible whereas at night we use artificial sources of light for seeing objects. (d) translucent, Question 7. Try to see a source of light; like a bulb or a candle; through the straight tube. The shape of shadow depends upon the (a) shape of the object (b) size of the object (c) size of source of light (d) colour of the source light Answer Question 22. By covering one side of the glass sheet by butter paper. (a) shape of the light source Even though we perceive the shadows edge to travel along a wall, in reality the increase in the length of a shadow is due to a new projection that travels at a speed equal to the speed of light from the interfering object. Its all about contrast. What is the difference between image and shadow?Answer: Question 6. Ans. (a) Translucent(b) Opaque(c) Transparent(d) Penumbra. (c) opaque. A shadow is formed only when light rays are blocked by an opaque object. A plane mirror changes the direction of light that falls on it. Rectilinear propagation of light. It is the outer part of a shadow. Umbra refers to the innermost region of the shadow that appears to be the darkest. (a) luminous WebSun and Venus. (a) straight line(b) curved line(c) zig-zag line(d) randomly, (ii) When an opaque object comes in the path of light it forms, (a) an image with colours(b) shadow(c) black and white image(d) depends on the colour of the light. Cellophane sheet is . Question and Answer forum for K12 Students. Answer: The extent of reflection depends upon the shine and smoothness of the surface. Lung cancer may appear as a shadow, with or without a well-defined nodule or mass. Write down the similarities and differences. Shadow does not provide any detail about the object, it gives an idea about the shape of the object. In fact most shadows are not totally black because light usually bounces around the obstruction off other objects. What are translucent objects? (b) wood Features of Image Formed Due to Reflection. When the object moves, its shadow is likely to expand in terms of dimensions faster than the speed of the objects movements. (a) Plane mirror(b) Pinhole camera(c) A straight pipe(d) Glass slab. Answer: (d) none of these, Question 4. Q.1 llaito a shert mole sin the finstory iof doumesfert? (a) planets This property of shadows has proved out to be very useful for long aided travelers. No light enters the eye from the shadow of the object. Question 4. When Parthiv asked the reason she said, today is solar eclipse at 2:15 p.m. Parthiv made her relaxed and said this is a natural phenomenon and nothing bad or unpleasant things are related to this. It is called Refraction which means that light bends as it goes through water this bending of the light can create a illusion where there may be a shadow BELOW the glass of water but the actual light going THROUGH the water is refracted into a different direction which can create the shadow which is not cast by the water. What is mirror? A pinhole camera is a device which casts a photographic image of a bright object on a screen. Answer: Q. Does the direction of shadow change during the day? (d) none of these, Question 40. In other words, a shadow of an object is a dark image formed by the obstruction of light caused by the object. (a) curved line the sunlight falls normally or orthogonally on the object (this is possible only in the region between the Tropic of Capricorn and Tropic of Cancer), then the angle of elevation becomes equal to 90, and cot() = 0. Source of light which is prepared by humans is known as man made source of light. Question 29. Let us perform an activity to learn about the characteristics of a shadow. An object which is known as a source of light. Question 2. Answer: An object which does not have its own light is called a non-luminous object, e.g., chair, moon, etc. Wood, metals, clay and black paper. WebA shadow is actually just a space or region, where there is no light since an opaque object is blocking light rays. Ans. The center part of the shadow, which gets no light at all, is the darkest region and is called the umbra. What is a shadow? It helps us to see the objects from which it comes or from which it is reflected. (d) a zig-zag line, Question 18. image. Light is a form of energy which when falls on the object enables us to see them. Aim: To observe differences between the image and the shadow of the same object. The human monkeypox virus (MPXV) was first identified in 1959. The endemic regions were identified in We can see only in the presence of light. Translucent Object: An object which allows partial passage to light is called a translucent object. Question 15. Which of the following are transparent or allows light to pass through it? (d) none of these, Question 23. Answer: More is the shine and smoothness of the surface, more will be the reflection. These solutions include answers to all exercise questions given in the NCERT textbook. The image formed by a pinhole camera is erect. Example: Sun, bulb, etc. Classify the following into transparent, opaque and translucent objects:Wax, spectacles, a heap of salt, a stone, dense smoke, wood, skin, balloon, rubber, membrane of a tabla, blood and milk. (d) none of these, Question 14. The shadow from an annular eclipse (when the moon appears smaller than the sun during an eclipse, and so a ring of light is visible around it) is called an anteumbra. Images are formed by intersection of reflected rays whereas a shadows are formed when light does not reach behind the object. Mirrors show regular and complete reflection. The formation of shadow shows that light travels in a straight line. What is reflection? It is always black, regardless of the colour of the object used to make the shadow. Answer: The darkness that an object cause when it prevents light to pass through is called _________, Question 6. A shadow comes from within a living thing and follows it around. Plywood sheet is a/an The following three things are required for a shadow to form: a source of light. Question 3. We cannot see through an opaque object. We can clearly see through a transparent object. A shadow exists because the object absorbs the light. Once the tube is bent at some angle, it is not possible to see the source of light through it. The objects which have light of their own are called luminous objects such as torch, bulb, burning candle, etc., whereas non-luminous objects does not have light of their own and can be seen only when light falls on them such as table, wall, book, etc. It can cause a shadow on chest X-rays. What do you mean by scattering of light? Question 12. This phenomenon of bouncing back of light is known as reflection. (c) sometimes long sometime circular (a) Transparent If the observer is located within an umbra, then the observer is likely to perceive a total eclipse. (c) Tube light Your Mobile number and Email id will not be published. Answer: The light comes back in the same plan when light falls on a shiny surface. Mirrors do not allow even a small amount of light to pass through them. This explains why we cannot see a shadow in the dark. Question 16. If an opaque (solid) object gets in the way, it stops light rays from traveling through it. Image gives more information such as colour, structure, etc., about the object. Give four examples of translucent object. However, the infection started to spread in 2017 to non-endemic regions such as North and South America, Europe, and Asia. WebThe philosophy of perception is concerned with the nature of perceptual experience and the status of perceptual data, in particular how they relate to beliefs about, or knowledge of, the world. When l = 0.75 or 1, the material flows to the inside of the rivet, and a vortex phenomenon also occurs. Question 7. (a) On which principle of light does a pinhole camera works? Solid wax is shailjarathore Answer: The area of shade formed by the obstruction is called the geometrical shadow. The shape and size of an objects shadow is affected by the positioning of the light source. Sometimes, you are able to see the Sun or the Moon behind the clouds. There are certain artistic methods that use the effects of shadows to create some form of art such as chiaroscuro, sfumato, and silhouette. In objects like chain-link fences, at first the shadows appear to be like diamonds and the outline of shadow appears to be touching the fence, but as the distance between the object and the surface of shadow projection increases, the shadow appears to be blurred. Answer: Communication back in the 1860s was pretty primitive. We can see through a translucent object but the vision would be murky. Answer: Question 11. As we know, the length of the shadow is proportional to the cotangent of the angle of elevation, we can say that, Ans. Question 30. (a) transparent The images formed by a pinhole camera are upside down, i.e., inverted image. When an opaque object comes in the way of light it makes Some of the differences between an image and a shadow are given in Table. A mirror is an example of What type of images is formed by it? (c) both of these The size of shadow totally depends on distance between object (a) erect Question 1. Natural Source of Light: Source of light which is already present in nature known as natural source of light. : Sun and other stars, Objects that do not produce their own light but reflect the light emitted by luminous objects are known as non-luminous objects. The moon is a non-luminous body. We consider moon as non-luminous body but still we can see things on a full moon night. Example: moon. (d) none of these, Question 16. It is a form of energy which makes objects visible as we cannot see objects in darkness.During day time sunlight acts as a source of energy which makes everything visible whereas at night we use artificial sources of light for seeing objects. Answer: Shadow is formed due to the phenomenon of rectilineas propryation of light. The size of shadow totally depends on distance between object and source of light. Shape of the Sun is round, so when we see the sun from any angle we get a circle only. of the object. Question 2: Classify the objects or materials given below as opaque, transparent or translucent and luminous or non-luminous: Air, water, a piece of rock, a sheet of aluminium, a mirror, a wooden board, a sheet of polythene, a CD, smoke, a sheet of plane glass, fog, a piece of red hot iron, an umbrella, a lighted fluorescent tube, a wall, a sheet of carbon paper, the flame of a gas burner, a sheet of cardboard, a lighted torch, a sheet of cellophane, a wire mesh, kerosene stove, sun, firefly, moon. Refer to the Light Shadows and Reflection Class 6 MCQs Questions with Answers here along with a detailed explanation. (b) inverted (c) white For example, we often observe that on a sunny day the shape and size of our shadows change. Objects which does not allow light to pass through them are called It is called shadow education because it mimics the mainstream curriculum. (a) Torch Sun rays falling on a flying bird form shadow in space. (d) Chair, Question 6. (d) none of these, Question 24. (d) None of these, Question 19. Mirror does not change the direction of light that falls on it. Fill in Since then, the incidence of the disease has been sporadic. Shadow. In pinhole camera, the image is free from spherical and . Answer: Question 18. Answer: We need the following in order to see a shadow. Question 17. Question 5. Answer: Moon does not emit light of its own. Question 2. Objects that emit light and heat are known as luminous objects. Ans. Afterwards rounded shaped images are formed on the earth. Image source: C. G. P. Grey,British Library Gate Shadow,CC BY 2.0. Now, keeping the positions of the torch and the screen to the torch. Three things are required for the formation of shadow, viz a source of light, an object and a screen. Answer: Shadow is formed by an object by obstructing light so that it doesnt reach a surface. Practice MCQ Questions for Class 6 Science with Answers on a daily basis and score well in exams. Answer: Those materials which do not allow light to pass through them, are called opaque objects. MCQ Questions for Class 10 Science Chapter 1 Chemical Reactions and Equations with Answers, Determiners Exercises for Class 10 CBSE With Answers, NCERT Solutions for Class 10 English First Flight Chapter 4 From the Diary of Anne Frank, NCERT Solutions for Class 9 Social Science Geography Chapter 2 Physical Features of India, Concise Mathematics Class 10 ICSE Solutions. 3. The most famous story of acoustic shadows effect on human history occurs not once, but pretty frequently throughout the Civil War, causing many historians to assert that this phenomenon had a significant impact on its outcome. When the object blocks the lights path, then a dark region appears on the other side. This enables us to see images. Question 6. Answer: The What do we need in order to see a shadow? Why is the moon not considered as a luminous body? An object which allows partial passage to light is called a translucent object. A rain shadow forms when moist winds head towards a set of mountains and get forced upwards by them. Image formed by plane mirror is For example imagine a green surface, it would absorb light in that range of the visible spectrum. of light. Light travels in a straight line. (a) shining mirror (a) When the earth, moon and sun are in a straight line, with moon in between, the shadow of moon falls on the earth and this is known as solar eclipse. It is to be noted that the communication between different points in a shadow does not exist except for the phenomenon of reflection or interference of light which occurs at the speed of light. Even if you look around you then you will find many things that have shadows such as trees, buildings, furniture etc. The object that does not give out light on its own is the Give suitable examples of each objects. Name some artificial source of light. This dark patch is called shadow. Answer: During reflection angle of incidence is equal to angle of reflection. The colour of opaque objects affect the dark colour of the shadow. What is a non-luminous body? A shadow is formed when there is a source of light. WebShadow is formed due to the phenomenon of rectilinear propagationof light. Question 3. Reflection b. Rectilinear propagation c. Diversion d. Dispersion (d) depends on the colour of object, Question 27. (b) He made a larger hole instead of a fine hole. What is a luminous object? All these questions are very important from examination point of view. (c) opaque objects Eventually, we can observe that if the height of the fence is not enough, then the pattern of light would move towards the shadow diamonds and light outlines. Answer: A cylinder object can cast shadows in two ways. Answer: Because they reflect light from the sun. Answer: Answer: We may say that clouds behave as translucent object. Benign tumors may similarly appear as a shadow or a spot. It is always either large or the same size as that of the object. (a) transparent objects Answer: In a dark room, we can see with torch light which goes straight. (b) Because these type of people are superstitious and doesnt know the scientific reason behind this. Question 1. Question 7. E.g. What is a pinhole camera? The sun radiates ultraviolet radiations that could be extremely harmful for our eyes. Solution For Shadow is formed due to the phenomenon of rectilineas propryation of light. (a) Electric bulb Example: moon. The ray of light that falls on a plane mirror is called Some common examples of sources of light are sun, bulb,etc. Question 4. (d) none of these, Question 37. an opaque object in the way of light, and. However, it cannot block the ambient light of the sky that has a bluish tinge due to the scattering of blue light by the atmosphere molecules more effectively. Answer: The following three things are required for a shadow to form (Fig. Question 4. Match the items given in column I suitably with those given in column II. Example: Sun. When a ray of light hits a surface it looses some energy, which depends on the surface material. 3. Answer: A building having the height of 20m casts a shadow on the ground. Why do we need a shiny surface for reflection? The image formed by a mirror is due to _________ of light. This creates an area of darkness on the side of the object away from the source of light. An object which allows only a small part of light through it, is called translucent object, e.g., wax paper, fog, etc. Answer: Answer: Moon is a non-luminous body because it shines by reflecting the sunlight falling on it. (d) A thin wooden sheet, Question 17. 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