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Q.

Why all the parallel rays reflected from a plane surface are not parallel?

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a

Because it does not follow the laws of reflection.

b

Because of the fault in the laws of reflection.

c

Because of the irregularities in the reflecting surface.

d

Because of the polished smoothness of the reflecting surface.

answer is C.

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Detailed Solution

When all the parallel rays reflected from a plane surface are not parallel, the reflection is known as diffused or irregular reflection. It is not due to the failure of the laws of reflection. It is caused by irregularities in the reflecting surface. 

For example, the surface of cardboard is not smooth. It has some irregularities. Therefore, the parallel rays reflected from such a surface will not be parallel.

 

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