Question

The incident ray, the refracted ray and the normal at the point of incidence all lie _____.

• A. in different planes
• B. in the same plane
• C. in mutually perpendicular planes
• D. at an angle of ${45}^{\circ }$ to each other

Answer 1

The correct option is B in the same plane

According to the laws of refraction:
1) The incident ray, refracted ray and the normal all lie in the same plane.
2) The ratio of the sine of angle of incidence to the sine of angle of refraction is constant for a given pair of media. This constant is called refractive index.