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Q.

Which of the following is/are not always necessary to observe a shadow?

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a

Sun

b

Screen

c

Source of light

d

Opaque objects

answer is A.

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Detailed Solution

Sun is not always necessary to observe a shadow.
Shadow is the dark area formed by opaque objects in the path of light by creating an obstruction in the path of light. To cast a shadow, a screen, an opaque object, and a light source are needed, which can be the sun, a torch, a lamp, etc., so we can say that the sun is not always necessary to cast a shadow. Other light sources can also be used.
Other sources of light, such as a torch, can also produce a shadow. A shadow is a space or region with no light because an opaque object obstructs the light rays.

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