Light enters air from water. the angle of refraction will be a. less than the angle of incidence. b. greater than or equal to the angle of incidence. c. less than or equal to the angle of incidence. d. equal to the angle of incidence. e. greater than the angle of incidence.

E. greater than the angle of incidence.

Explanation:

Snell's law states that:

(1)

where

are the refractive index of the first and second medium

are the angle of incidence and refraction, respectively

For light moving from water to air, we have:

(index of refraction of water)

(index of refraction of air)

Substituting into (1) and re-arranging the equation, we get

which means that

so, the correct answer is

E. greater than the angle of incidence.

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