​A light ray enters from medium A to medium E, and as a result, it bends away from the normal in the medium B. The refractive index of medium B relative to medium A is:​

Correct option is C

The correct answer is (C) less than unity.

• Refraction is the process by which a wave bends when it encounters a medium that has a speed that is different from its own. The light beam is refracted as it passes through a fast medium and enters a slow medium, which causes it to bend in the direction of the boundary between the two media.
• The degree of bending depends on the two media's indexes of refraction.
• The refractive index determines how much a light beam bends when it passes through one medium and then another.
• When moving from medium A to medium B, if medium A is rarer and medium B is denser, the ray of light bends towards the normal in this circumstance.
• In contrast to denser media, rarer media have a greater light speed than denser media do.