Refractive index of glass is

Refractive index of water is

Critical Angle=

According to the question:

There will be two angles of incidence:

(1) When light ray passes through the normal

Angle of incidence =

Angle of refraction=

Angle of deviation =

(2) When light ray incident at critical angle

(As light ray is passing from glass to water)

⇒

⇒

⇒

⇒ Angle of deviation=

=

=

If angle of incidence increases beyond critical angle, total internal reflection will occur. So, the range of angle of deviation is