Question

1. A narrow beam of light is incident normally on one face of an equilateral glass prism of refractive index 1.45. when the prism is immersed in a suitable liquid, the ray makes a grazing emergence along the other face. find the refractive index of this liquid and draw a diagram showing the path of rays.

2. white light is passed through a glass prism of angle 5 . if the refractive indices for red and blue colours are1.641 and 1.659 respectively. calculate the angle of dispersion between these colours

Answer 1

A ray of light falling normally on the face AB of an equilateral glass prism having refractive index 3/ 2 placed in water of refractive index 4/3 .will this ray suffer total internal reflection on striking the face AC?