Why is emergent ray parallel to incident ray in a glass slab refraction?

Asked by pb_ckt | 3rd Mar, 2019, 03:59: PM

Expert Answer:

When light ray incident on the glass surface it gets refracted with some particular angle this is call angle of Refraction this can be found by using Snell law. When light ray comes out from glass it is called emergent ray and at this point I point it also get refracted by same angle as it was initially refracted.
Since the incident angle and emergent angle is same then the incident ray and emergent ray will be parallel.

Answered by Ankit K | 3rd Mar, 2019, 04:46: PM