Question

Define Snell's law of refraction. A ray of light is incident on a glass slab at an angle of incidence of 60°. If the angle of refraction be 32.7°, calculate the refractive index of glass. (Given: sin 60° = 0.866 and sin 30° = 0.5).

Answer 1

Explanation:

SNELL LAW :

i. The incident ray, the reflected ray and the normal at the point of incident all lie in the same plane .

.ii The ratio of the Sine of angle of incident i to the Sine of angle of refraction R is constant for the pair of given media .

The refractive index = Sin i / Sin r.

The refractive index = Sin 60° / Sin 30°

Refractive index = 0.866 / 0.5

= 1. 73 mew.

Thank you

Answer 2

Explanation:

Snell's law: According to the Snell's law of refraction, the ratio of sine of angle of incidence to the sine of angle of refraction is constant for a given pair of media.

Refractive index = sine of the angle of incidence/sine of the angle of refraction

Given: Angle of incidence = 60o

Angle of refraction = 32.4o

Refractive index = sine of the angle of incidence/sine of the angle of refraction

Refractive index = sin 60o/sin 32.4o

Refractive index = 0.866/0.540

= 1.603