A shadow is the dark region that is formed when an opaque object is placed in the path of light. Which one of the following is not required for the formation of a shadow?

Source of light

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Screen

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Opaque object

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Lens

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Solution

The correct option is B Lens
Shadow is a space when the light is blocked by an opaque object. It is a part where light does not reach. Shadow is formed when an opaque object is placed in the path of light. For shadow formation, there should be a source of light, an opaque object and a screen where the shadow reflects. A shadow can not be formed through a transparent object likewise lens can't form shadow as the light will pass directly through it.

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