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The path of a ray light coming from air ...

The path of a ray light coming from air passing through a rectangular glass slab traced by four students are shown as A, B, C and D in Figure. Which one of them is correct ?

A

A

B

B

C

C

D

D

Text Solution

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The correct Answer is:
B
In a rectangular glass slab, the emergent rays are parallel to the direction of the incident ray, because the lateral daviation of bending of the ray of light at the opposite parallel faces (air-glass) and (glass-air interface) of the rectangular glass slab are equal and opposite. This is why the ray emerges are parallel to the incident ray.
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