![]() ![]() Objects that cannot give out or emit light of their own are known as non- luminous objects. It can be used to image the sun and brightly lit objects.ģ: Why is shadow formed when an opaque object comes in path of light?Īnswer: Light travels in a straight line and when opaque object obstructs it, shadow is formed.Īnswer: When any surface reflects light without absorbing it, it is known as reflection.ĥ: Classify the objects as opaque, transparent and translucent-įog, glass, wood, plastic box, smoke, waterĦ: Why we cannot see our image in the mirror in complete dark room?Īnswer: We cannot see our image in the mirror in complete dark room because there is no light to reflect.ħ: Classify the following as luminous and non luminous object:Ĩ: What is the difference between luminous and non-luminous objects?Īnswer: Objects that give out or emit light of their own are known as luminous objects. Transparent objects allow light to pass through them completely whereas translucent objects doesn’t allow light to pass through them completely.Ģ: What materials can be used to make a pinhole camera? How can it be used?Īnswer: Pinhole camera can be made with simple material like cardboard, tracing paper etc. ![]() Such objects are known as translucent objects. Whereas there are some objects through which we can see but not clearly. Short Answer Type Questionsġ: What is the difference between transparent and translucent object?Īnswer: If we are able to see clearly through an object, it is said to be transparent. Whether the moon is luminous or non-luminous body?Īnswer: Umbra is the dark region behind object facing light which does not receive light at all.Īnswer: Light ray travels in a straight line.Īnswer: Sun is a natural source of light.Īnswer: Shadow is the dark space behind an opaque object where light does not reach. How does it shine at night?Īnswer: Moon reflects the light of the sun at night.ĩ. What are the three things required for the formation of shadows?Ĩ. How can a transparent sheet be converted into a translucent sheet?Īnswer: By greasing the paper with oil or fat.ħ. Will there be any difference in the shadow formed on the screen in A and B?Ħ. The light from which of the torches will not form a shadow of the ball on the screen?Īnswer: The light of torch at position C will not form a shadow of the ball on the screen.Īnswer: Eclipse is a shadow formed in space that makes the sun or the moon invisible for some time. Three torches A, B and C shown in figure given below are switched on one by one. What is the type of material of this sheet?Īnswer: A sheet of transparent material is placed at ‘P’.ģ. A sheet of some material is placed at position ‘P’, still the patch of light is obtained on the screen. If you obtain an image of the sun on a wall through these holes, will the image formed by these holes be the same or different?Īnswer: The image obtained will be the same in all the three cases.Ģ. You have 3 opaque strips with very small holes of different shapes as shown in figure. ![]()
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