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Q.

Is it true that an object can be seen only if it emits light?


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a

True

b

False 

answer is B.

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Detailed Solution

The above statement is False.
Luminous bodies can emit light. Non-luminous bodies cannot emit light. An object can be visible even if it does not emit light because an object can be seen if it reflects the light falling on it. Every object does not have its own light. The best example is the moon, which does not have its own light sources but illuminates by reflecting the light from the sun.
The correct statement would be an object can be seen even if it does not emit light.
 
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Is it true that an object can be seen only if it emits light?