Question

when is angle of incidence same as angle of refraction?​

Answer 1

When the angle of incidence is equal to the critical angle then the angle of incidence is equal to the angle of refraction.

Here critical angle means when a ray passes fron a rarer medium to a denser medium then it creates critical angle when again afer reafraction to rarer medium becomes equal to the angle of incidence.Eg,As we see the refraction through a glass slab.

Explanation:

Hope it heps.