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

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