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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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संबंधित प्रश्न
Fill in the blank.
The darkest portion of a shadow is called the ................
What is a shadow? Give a reason for its formation.
In the following diagram, draw rays to form umbra on the screen.
In the following diagram, draw rays to form a penumbra on the screen.
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Tick the correct answer.
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Answer the following.
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What is penumbra?
When does a shadow form?
What are the essential conditions for the formation of shadow?
What do we need in order to see a shadow?
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Three torches A, B and C shown in the following figure are switched on one by one. The light from which of the torches will not form a shadow of the ball on the screen.
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