Question

The Snell’s law is given by

(a) N1 sin θi = N2 sin θt

(b) N2 sin θi = N1 sin θt

(c) sin θi = sin θt

(d) N1 cos θi = N2 cos θt

I have been asked this question during an online interview.

My doubt stems from Snell Law and Critical Angle in portion EM Wave Propagation of Electromagnetic Theory

Answer 1

The correct choice is (a) N1 sin θi = N2 sin θt

For explanation: The Snell law states that in an oblique medium, the product of the refractive index and sine of incidence angle in medium 1 is same as that of medium 2. Thus it is given by N1 sin θi = N2 sin θt.