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प्रश्न
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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उत्तर
Some of the reasons can be
- The screen is far away from the ball.
- The beam of light from the torch is falling parallel to the screen on the ball.
- The torch is kept away from the ball.
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