A firefly is a luminous body. (c) both of these (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. What is rectilinear propagation of light? Question 1. Name four natural luminous bodies. Natural Source of Light: Source of light which is already present in nature known as natural source of light. Answer: Total classes on Filo by this tutor - 2948, Connect with 50,000+ expert tutors in 60 seconds, 24X7. This explains why we cannot see a shadow in the dark. | Origins, Parts and Themes of Literature Modernism, Tili Kannada Text Book Class 5 Puraka Odu Gadhe Mathugalu, We Are Not Afraid To Die If We Can All Be Together Summary in English by Gordon Cook and Alan East, MCQ Questions for Class 10 English with Answers First Flight, Footprints Without Feet, A Thing of Beauty Summary in English by John Keats, Were Not Afraid to Die If We Can All Be Together Class 11 MCQ Questions with Answers English Chapter 2, Samuchaya Bodhak , Conjuction In hindi, The Browning Version Summary in English by Terence Rattigan, Deep Water Summary in English by William Douglas, MCQ Questions for Class 9 Civics Chapter 1 Democracy in the Contemporary World with Answers. A shadow is formed when an opaque object comes in the path of light. (b) He made a larger hole instead of a fine hole. The formation of shadow shows that light travels in a straight line. In areas where the amount of received rain is low or the area is very dry, the term rain shadow is used to describe the place with the dominant wind direction, elevation and other factors that keep the area dry. Air is (b) incident ray The won't be any "fuzziness" if we have a single, small source. Answer: (b) red It can cause a shadow on chest X-rays. Answer: Answer: Shadow is not just the two-dimensional outline that you see on the ground. Why shadows are black in colour? (b) the movement of the light source Class 6 Science Chapter 11 Light: Shadows And Reflections From Extra Questions section includes multiple choice questions (MCQs), short and answer type questions etc. Answer: Question 30. As when light falls on an object, light gets reflected and this reflected light comes to us which makes the object visible. This happens because light travels in a straight line. The images formed by a pinhole camera are upside down (inverted images). Close your eyes while looking towards bright sunshine. The difference between shadow and reflection is that a shadow is formed by the blocking of light rays by any object. A shadow is formed when an opaque object is placed in the path of light. Material needed: A mirror. Images formed by a pinhole camera are upside down, i.e., inverted images. Characteristics of shadow are as follows: 1. A blackboard is a luminous object. Objects that emit light and heat are known as luminous objects. Web(e) Shadow (v) Formed due to reflection by mirrors (f) Image (vi) Object through which we cannot see clearly (g) Reflection (vi) Phenomenon of changing left to right (h) Lateral inversion (vii) Produces light of its own Question 9. (d) none of these, Question 15. 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To know more about Reflection on a Plan Mirror, visit the link below; Learn more about the Light, Shadows, and Reflections from the topics given below: The energy derived from the sun, a lamp, etc. (d) diminished, Question 21. (a) opaque objects The property due to which light travels in a straight line is called rectilinear propagation of light. 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. Compare it with your image as you see it in a mirror. A plane mirror changes the direction of light that falls on it. 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. there is an opaque object in the way of light. What would be the length of the shadow of an 8ft tree place in the same surface as that of the man. (c) both of these 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. (b) Why do you think that some people believe that these eclipses will have some bad effect on them? What type of images is formed by it? About Us Become a Tutor Blog. Question 5. A pinhole camera uses a lens to form a real and inverted image. Question 31. (a) Rubber We can clearly see through a transparent object. (d) shining mirror, Question 36. (c) light bulb In bright light this difference is more pronounced i.e. The object which does not have light of its own is The worlds only live instant tutoring platform. (c) translucent objects Translucent: A sheet of polythene, smoke, a sheet of plane glass, fog, a sheet of cellophane, a wire mesh. An object which is known as a source of light. (b) Chair Since the man and the tree is on the same surface they must be facing the same elevation angle from the light source. Answer: The light comes back in the same plan when light falls on a shiny surface. Define opaque objects with example. The light from outside enters through the small hole and forms an image on the screen that is inverted. Question 4. What is an opaque object? (b) moon Example: Sun. Contrary to popular belief, the shadow is not entirely dependent on the size and the shape of the object. If an opaque (solid) object gets in the way, it stops light rays from traveling through it. 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. When an opaque object is placed in its way, a dark patch is formed behind the object. Question 11. The glass sheet of plane mirror offers a . No light enters the eye from the shadow of the object. Question 30. What are the two types of eclipse? (d) none of these, Question 23. The endemic regions were identified in Africas central and western areas. This dark patch is called shadow. Example: Sun. Answer: A shadow is a dark outline or image cast by an opaque object that blocks light coming from a source of light. WebShadows are formed because: A Opaque bodies allow the light to pass through them B Light can bend around the opaque bodies C Light rays cannot pass through the opaque We know that light propagates in a straight line i.e. What is mirror? Light travels in a curved line. The part of the shadow which occurs in the centre is called penumbra. Sun is the universal source of light. Answer: A translucent object also creates a faint area of darkness. These solutions include answers to all exercise questions given in the NCERT textbook. A virtual image is the apparent convergence of diverging light rays. The size of the image formed by a plane mirror is same as that of the object. Moon reflects the light of sun in the night. The increase of size and movement is also true if the distance between the object of. It is the outer part of a shadow. When light is incident on a surface, it gets reflected or it bounces back. Question 2. Question 27. . It glows due to reflection of sunlight by it. Any surface that is really well polished or shiny acts like a mirror. Everywhere else around the opaque object, the light continues in a straight path until it bounces off the ground or wall behind the object. The size of the umbra and penumbra depends on various factors such as the size of the source, size of the object, and the distance between the source and the object as well as the distance between the object and the screen. (d) What value of Parthiv is shown here? Answer: Those objects which allow only a small part of the light rays to pass through them are called translucent objects. (a) luminous Objects that do not give out or emit light of their own are called We can clearly see through a transparent object. On the basis of ability to pass light through an object, objects are classified into three main groups, i.e., Light travels in Question 4. In this case, the shadows formed are smaller in length and are cast directly underneath the objects mostly. Question 5. Fig (1): It is used to understand the phenomenon of rectilinear propagation of light. Answer: the shadow of a cone appears to be a triangle on the screen. Light rays travel from a source in straight lines. the light ray falling on the opaque object is blocked by it. The image formed by a mirror is due to _________ of light. In the picture above, we can see that the shadow of an opaque object (ball) is formed on the screen when the object is placed in front of an extended source of light. Any explicit account of perception requires a commitment to one of a variety of ontological or metaphysical views. Give four examples of translucent object. The size of a shadow varies depending on the distance between the object and the source of light, and the distance between the object and the screen. It is formed when light hits the opaque object which does not let the light pass through. A rain shadow forms when moist winds head towards a set of mountains and get forced upwards by them. Benign tumors may similarly appear as a shadow or a spot. Question 28. It is crucial in the early stage of a geological mapping as it is less time Three things are required for the formation of shadow, viz a source of light, an object and a screen. Example: Sun, bulb, etc. (d) all of these, Question 39. Name sources of light that are not hot. (a) A light ray falling on a smooth, shiny and polished surface (say a plane mirror) is called the incident ray. With two point sources, there would be two separate shadows. Question 3. Answer: Question 13. Which types of objects do not allow light to pass through them? We are able to see the things around us due to . When the object blocks the lights path, then a dark region appears on the other side. (c) rubber A shadow, which is projected over an area at large distances (like light years) is unable to communicate information between the surfaces at such distances with the edge of the shadow. E.g. (ix) Which of the following is a cold source of light? With the increase in distance between the object and the surface of projection the size of the shadow or the silhouette increases. The shape and size of an objects shadow is affected by the positioning of the light source. Shadows are formed by light, because if light shines onto an object, and the object blocks the light, the light will go sideways of the object, and therefore, a shadow is formed. Most shadows are made up of the umbra and the penumbra. All light is blocked by an opaque object in the umbra. Since then, the incidence of the disease has been sporadic. animed annimals reat to carey fis leado. Question 12. Question 15. We can see through a translucent object but the vision would be murky. Question 11. Required fields are marked *. Question 18. Ans. (c) a straight line The unlighted area is called the shadow. Question 23. 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. A shadow comes from within a living thing and follows it around. When the earth comes in between the sun and the moon, the shadow of the earth falls on the moon. The working of a pinhole camera is based on the property of _________ propagation of light. Question 15. 3. Is always black, regardless of the colour of the object. All the planets and the moon are the . One can see clearly through these objects. Download Filo and start learning with your favourite tutors right away! (d) none of these, Question 37. Which one of the following is the natural source of light? Answer: 13.4): a source of light; an opaque object; a screen or irface behind the object. Candle, bulb, kerosene oil, lamp and torch. (c) circle Three basic things are required in shadow formation: We have already learned that the light travels in straight lines. Aim: To observe differences between the image and the shadow of the same object. Give four examples of transparent objects. 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