Question

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.

Answer 1

Answer:

E. greater than the angle of incidence.

Explanation:

Snell's law states that:

$n_i sin \theta_i = n_r sin \theta_r$ (1)

where

$n_i, n_r$ are the refractive index of the first and second medium

$\theta_i, \theta_r$ are the angle of incidence and refraction, respectively

For light moving from water to air, we have:

$n_i = 1.33$ (index of refraction of water)

$n_r = 1.00$ (index of refraction of air)

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

$\sin \theta_r = \frac{n_i}{n_r} sin \theta_i = 1.33 sin \theta_i$

which means that

$\theta_r > \theta_i$

so, the correct answer is

E. greater than the angle of incidence.

Answer 2

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.

Further explanation

Refractive Index is the value that calculated from the speed of light ratio in a vacuum to in a second medium of greater density. The refractive index variable is symbolized by the letter $n$ or $n'$ in descriptive text and mathematical equations.

Light enters air from water, the angle of refraction will be greater than the angle of incidence.

When light passed from a less dense to a more dense substance for example passing from air into water, the light is refracted towards the normal. The normal is a line perpendicular (forming a 90 degree angle) to the boundary between the two substances.

Hope it helps!

Learn more

1. Learn more about The angle of refraction brainly.com/question/2660868
2. Learn more about the angle of incidence brainly.com/question/1562672
3. Learn more about the law of reflection brainly.com/question/12617938

Answer details

Grade:  9

Subject:  physics

Chapter:  refraction

Keywords:  The angle of refraction, the angle of incidence