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Q.

Is it true that a ray of light falling on one face of a rectangular glass slab that must be emerging from the opposite face of the slab is parallel to the direction of the incident ray?


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a

True          

b

False 

answer is A.

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Detailed Solution

The above statement is true.
The direction at which the light ray bends and also the extent by which it bends at the opposite face of the glass slab is equal and opposite. Since they are equal and opposite, the net bending of the ray of light becomes zero, resulting in the emergent ray travelling in a direction parallel to the direction of the ray of light that is incident on the glass slab.
 
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