Total internal reflection and critical angle

Define critical angle for total internal reflection and write its relation with refractive index.

Total internal reflection can take only if

In total internal reflection when the angle of incidence is equal to the critical angle for the pair of medium in contact, what will be angle of refraction? In total internal reflection when the angle of incidence is equal to the critical angle for the pair of medium in contact, what will be angle of refraction? In total internal reflection when the angle of incidence is equal to the critical angle for the pair of medium in contact, what will be angle of refraction?

In Fig., find the maximum angle i for which light suffers total internal reflection at the vertical surface. .

Consider the situation shown in figure. Find the maximum angle theta for which the light suffers total internal reflection at the vertical surface.

(a) Under what conditions is the phenomenon of total internal reflection between the critical angle of incidence and the refractive index of the medium. (b) Three lenses of focal lengths+10 cm, -10 cm and + 30 cm are arranged coaxially as in the figure given below. Find the position of the final image formed by the combination.