PYQ NEET- Total Internal Reflection

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. (NEET 2019)

Answer:

The refractive index of glass is given by:

n = sin i/sin r

where,

• n is the refractive index of glass
• i is the angle of incidence
• r is 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,