Three torches A, B and C shown in figure are switched on one by one. The shadow of the ball will not be casted, when __________is/are switched on.

torch A

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torch B

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torch C

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both torch A and torch B

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Solution

The correct option is C torch C
Shadow is formed, when an opaque or translucent object is placed in between a screen and a light source. In the above case, the shadow is formed when torch $A$ and $B$ is switched on. When torch $C$ is switched on, the shadow cannot be formed as there is no screen behind the object.

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