Question

define refraction through a glass slab

Answer 1

When a ray light passes obliquely from a rarer medium to the glass slab the ray of light bend towards the normal........then when the light passes forward it moves from the denser medium to the rarer medium thus the light bends away from normal the light emerged is called emergent ray......the distance between the original ray and emergent ray is called lateral Displacement

Answer 2

Refraction Of Light Through A Glass Slab. Refraction through a rectangularglass slab and principle of reversibility of light: ... On entering the glass slab, it bends towards normal and travels along EF at an angle of refraction r. The refracted ray EF is incident on face SR at an angle of incidence