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. (JEE Main 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. (JEE Main 2017)
The answer is: 30o
The formula for refraction is:
n = sin(i)/sin(r)
