Question

The first law of refraction states that the incident and refracted rays are in the same ________ as the normal.

• A. phase
• B. plane
• C. both
• D. none

Answer 1

Answer: (B)

Correct answer is (B) plane

The first law of refraction states that the incident and refracted rays are in the same plane as the normal. The normal line is to the surface of the mirror which makes a 90 degree angle to the mirror. The angle of incidence is the angle that the incident ray makes the normal and the angle of reflected angle that the reflected ray makes with the normal.