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A student had a ball, a screen and a torch in working condition. He tried to form a shadow of the ball on the screen by placing them at different positions. Sometimes the shadow was not obtained. Explain.
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Following are the some reasons due to which the shadow cannot be obtained:
- He cannot get shadow on the screen if the screen is placed far away from the ball.
- The beam of light from the torch is falling parallel to the screen on the ball due to which the ball doesn't obstruct the whole light from the torch and shadow is not obtained.
- The torch is kept away from the ball. This makes the source of light far away. So enough light doesn't reach the ball.
An accurate shadow of the ball is formed only if the ball, torch, and screen are in the same straight line. The figure shown illustrates it.
- He cannot get shadow on the screen if the screen is placed far away from the ball.
- The beam of light from the torch is falling parallel to the screen on the ball due to which the ball doesn't obstruct the whole light from the torch and shadow is not obtained.
- The torch is kept away from the ball. This makes the source of light far away. So enough light doesn't reach the ball.
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