Question

How reflection through glass slab

Answer 1

reflection can't be ok by glass slab only refraction can be popular in glass slab when you pass the reopen object through glass slab it will bend towards the normal

Answer 2

Here is your answer..

Refraction through a rectangular glass slab. ... Emergent ray is parallel to incident ray because the extent of bending of the ray of light at the opposite parallel faces which are PQ (air-glass interface) and SR (glass-air interface) of the rectangular glass slab is equal and opposite.

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