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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 object 

answer is D.

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Detailed Solution

Opaque object is not always necessary to observe a shadow.
Sun will not form a shadow because the brightness of the sun is very high, so the sun cannot form a shadow. Shadows are formed by using other sources of light, such as a torch. To obtain a shadow, there is always a need for a screen, a source of light and an object.
 
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