Question

(i) State the Snell’s laws of refraction of light. 

(ii) Write a relation between the angle of incidence 

(i), angle of emergence (e), angle of prism (A) and angle of deviation (d) for a ray of light passing through an equilateral prism.

Answer 1

(i) Laws of refraction of light: 

(i) Incident ray, refracted ray and normal at the point of incidence all lie in the same plane. 

(ii) Ratio of sine of angle of incidence to the sine of angle of refraction is a constant quantity known as refractive index of the medium.