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Q.

Which of these conditions is not essential for a shadow to be produced?


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a

The sun

b

A light source

c

An opaque object

d

A screen/surface  

answer is A.

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Detailed Solution

The Sun is not essential for a shadow to be produced.
The sun is not compulsory for the formation of a shadow. There must be an opaque substance present. A screen and light source must be present. The item must be positioned in the path of the light. After that, a shadow appears on the screen. The sun is mandatory for the formation of shadow because without the sun we can form a shadow by any light source.
 
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