Previous Year NEET Question- What Is Light

1. A ray of light strikes a glass slab at an angle of incidence of 60o. If the angle of refraction is 45o, find the refractive index of glass. (NEET 2018)

The answer is: √3

The formula for refraction is:

n = sin(i)/sin(r)

where n is the refractive index, i is the angle of incidence, and r is the angle of refraction.

In this case, we have i = 60o and r = 45o. Substituting these values into the formula, we get:

n = sin(60o)/sin(45o) = √3

2. A ray of light travelling from air is incident on a glass slab at an angle of incidence of 45o. If the refractive index of glass is 3/2, find the angle of refraction. (NEET 2017)

The answer is: 30o

The formula for refraction is:

n = sin(i)/sin(r)