A light ray enters medium A from medium B as shown in the figure. The refractive index of medium B will be lower than that of A.

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zero

less than unity

greater than unity

equal to unity

answer is A.

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Detailed Solution

Refraction is the term for the bending of a wave when it enters a medium moving at a different speed.
Light refracts when it transitions from a fast to a slow medium, bending the light ray in the direction of the typical boundary between the two media.
The refraction indices of the two media influence how much bending occurs.
The amount that a light beam bends as it passes through one medium and into another is determined by the refractive index.
As light moves from medium A to medium B in this scenario, it bends toward the norm, making medium A rarer and medium B denser.
A rarer medium $(μ_{1})$ has a higher speed of light than a denser one, $(μ_{2})$ i.e., $μ_{1} > μ_{2}$