Light from a point source placed at the bottom of a rectangular glass slab of thickness 5 cm is internally reflected by the upper surface and a circle of radius 8 cm is formed at the bottom. Find the refractive index of glass.

Light from a point source placed at the bottom of a rectuangular glass slab of thikness 5 cm is internally reflected by the upper surface and a circle of radius 8 cm is formed at the bottom. Find the R.I. of glass.

What is the time taken by light to travel through a glass slab of thickness ‘d’ and refractive index mu ?

A source of light is placed at the bottom of a tank filled with water up to the height of 80 cm. Calculate the area at the surface of water through which light rays will be emitted. Refractive index of water = 1.33.

A beam of parallel light rays are incident on a surface of a glass plate at angle 60^(@) . If the reflected rays from the glass surface get totally poarised-(i) What would be the magnitude of refracted angle? (ii) What is the refractive index of glass?