Question

In the experiment of refraction through a glass slab the angle of incidence should be less than 90°.why

Answer 1

Answer:

yes . in the experiment of refraction through a glass slab, the angle of incidence should be less than 90 because if it is 90, the incident ray will be parallel to the surface of the medium. then the light does not enter the medium. then how will the refraction take place.