A right angled triangular prism of refractive index `mu_(1)` is kept floating on a liquid (surface) having refractive index `mu_(2)`. The condition such tat light incident normally passes through base of prism as shown in figure.

A ray of light passing through a prism of refracting angle 60^(@) has to deviate by at least 30^(@) . Then refractive index of prism should be

A ray of light passing through a prism of refracting angle 60^(@) has to deviate by at least 40^(@) . Then refractive index of prism should be

A ray of light passing through a prism of refraction angle 60^(@) has to deviate by atleast 30^(@) . Then, refractive index of prism should be

A ray of light passing through the medium of refractive index mu_(1) is incident on the surface of separation of another medium of refractive index mu_(2) . A part of the ray is reflected and another part is refracted. What should be the angle of incident so that reflected ray and the refracted ray are at right angles to each other?