A ray of light from a monochromatic point source of light is incident at a point on the screen. If a thin mica film of thickness t annd refractive index n is introduced in its path, then the optical path

Obtain the equation for optical path of a medium of thickness d and refractive index n.

When a transparent parallel plate of uniform thickness t and refractive index mu is interposed normally in the path of a beam of light, the optical path is

When a transparent parallel plate of uniform thickness t and refractive index mu is interposed normally in the path of a beam of light, the optical path is

A beam of light is converging towards a point P on a screen. A plane parallel plate of glass of thickness in the direction of beam = t , refractive index = n is introduced in the path of the beam. The convergence point is shifted by