Question

In refraction of light through glass slab, the direction of incident ray and refracted ray are *parallel to each other*
pls explain me how they are parallel

Answer 1

The incident ray and the emergent ray are parallel to each other. The light ray enters the slab from air which is why it bends towards the normal. In the case of emergent ray, the same refracted ray exits the slab into air, hence moving away from the normal. If we produce the incident ray, we can find that it is parallel to the emergent ray. This phenomenon is called Lateral Displacement. It occurs due to the Snell's Law which can be proved mathematically.

Answer 2

I think it is chapter of light reflection and refraction.

it is due to the . the extent of bending of the ray of light at the opposite parallel faces ..
this is because the ray emerges parallel to the incidents ray .

I hope it's clear to u
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