Q. A ray of light strikes a glass slab at an angle of incidence of 60°. If the angle of refraction is 45°, find the refractive index of glass. (JEE Mains 2019)
Answer:
The refractive index of glass is given by:
n = sin i/sin r
where,
nis the refractive index of glassiis the angle of incidenceris the angle of refraction
In this problem, we have:
i= 60°r= 45°
Therefore, the refractive index of glass is:
n = sin 60°/sin 45° = √3/√2 = 1.732
Explanation:
The refractive index of a material is a measure of how much slower light travels in that material compared to the speed of light in a vacuum. The refractive index of a material is also related to the angle of incidence and the angle of refraction. The greater the refractive index of a material,
