# A Light Ray Enters From Medium a to Medium B as Shown in Figure. The Refractive Index of Medium B Relative to a Will Be

By K Balaji|Updated : November 9th, 2022

(a) greater than unity

(b) less than unity

(c) equal to unity

(d) zero

A light ray enters from medium A to medium B as shown in Figure. The refractive index of medium B relative to A will be greater than unity.

1. The ratio of the speed of light as it travels in a vacuum to that of the medium is known as the refractive index.
2. Light tends to bend toward the normal when it moves from a rarer to a denser medium.
3. Light has a tendency to deviate from the usual when it moves from a denser to a rarer medium.
4. The figure makes it obvious that the light beam bends in the direction of normal.
5. Therefore, the light beam is moving from a rarer to a denser medium.
6. Compared to the denser medium, the rarer medium has a faster speed of light.
7. To put it another way, if v1 is the speed of light in medium A and v2 is the speed of light in medium B, then v1 > v2
8. The refracting index for the specified circumstance is if the refractive index is µ = v1/v2 > 1

### Formula of Refractive Index

Refractive indexes have no dimensions. It is a measurement of how much slower a light wave would move through a substance than it would in a vacuum. The refractive index, denoted by the symbol n, is calculated by dividing the speed of light in a medium by the speed of light in vacuum. The refractive index formula is as follows:

n = c/v

Where,

c is the velocity of light in a vacuum (3 × 108 m/s)

n is the refractive index

v is the velocity of light in a substance

Summary:-

## A Light Ray Enters From Medium a to Medium B as Shown in Figure. The Refractive Index of Medium B Relative to a Will Be (a) greater than unity (b) less than unity (c) equal to unity (d) zero

According to Figure, a light ray travels from medium A to medium B. When compared to medium A, medium B will have a refractive index greater than unity.

Related Questions:-