Explain by using graph the minimum angle of deviation of a ray of light passing through a prism. (Graph sheet is not required. )

For a light ray passing through a given prism

The angle of deviation of a ray of light refracted through a parallel glass slab is

Angle of deviation when pass through optical centre

Under what condition the angle of deviation of a refracted ray through a prism will be minimum? '

The refracting angle of a prism is 60^(@) and the refractive index of its material is sqrt((7)/(3)). Find the minimum angle of incidence of a ray of light falling on one refracting face of the prism such that the emerging ray will graze the other refracting face.

The refractive angle of a prism is 60^(@) . If the prism is immersed in a liquid then the minimum angle of deviation is 30^(@) . Critical angle of glass with respect to the liquid is