As shown in Figure, a light ray enters from medium A to medium B. The ratio of refractive index of medium B to medium A will be__

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greater than unity

less than unity

equal to unity

zero

answer is A.

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Detailed Solution

The refractive index of medium B relative to medium A will be greater than unity.
Refraction is the bending of a wave when it passes through two different mediums with different speeds. The refraction indices of the two mediums determine the amount of bending. The refractive index measures how much a light beam bends as it travels from one medium to another. The greater the refractive index more will be the bending of light. The faster the speed of light in a medium lower will be the refractive index of the medium.

Absolute refractive index = \frac{speed of light in vacuum}{speed of light in the given medium .}

As the bending of light is more in medium B than that of medium A. So the refractive index of medium B will be greater than that of medium A. So the ratio of the refractive index of medium B to that of medium A will be greater than 1.

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