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Q.

To get a shadow, we need?


SuNon–luminous


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a

Only a source of light.

b

Only an opaque object.

c

Both are a source of light and an opaque object.

d

Neither a source of light nor an opaque object. 

answer is C.

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Detailed Solution

We need a light source and an opaque object to get a shadow.
A shadow in a dark area is the same shape as the object on which light falls, where light is blocked due to an opaque object. Shadows can be formed when light is made to fall on a screen, and in between them, an opaque object is kept. So, from this, we can infer that to get shadows, we need a light source and an opaque object.
  
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