Q7.a) What happens to the shadow formed on a screen when: i) The distance between the source of light and the object is increased. ii) The distance between the object and the screen is increased. b) What are the essential conditions necessary for the formation of shadow? c) Write one use of pinhole camera. d) Why is the flash of lightning seen earlier than the sound of thunder?
Answers
Answer:
a)
i) The shadow will be less in size.
ii) The shadow will be more in size.
b) The things which are necessary for the formation of a shadow are: An object(from which a shadow is created), a screen(on which the shadow will be formed), and at last a source of light is required ex: torch, candle etc...
c) Pinhole camera is useful for us to see an image in in an upside down way.
d) The flash of the lightning is seen earlier that the sound of thunder because the speed of sound is approximately 10 crore metre per second whereas the speed of sound is only 300 metre per sec.
Explanation:
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1. It depends on the distance of the light.
2. Same answer as 1.
3. a. Source of light
b. Opaque or transculent object
c. Screen on which the shadow will be formed
4. I really don't know about that
I hope it will be helpful for you...