Which of the following is a law of reflection of light?
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → The angle of incidence is equal to the angle of reflection.
Reflection of light follows two laws: the angle of incidence is equal to the angle of reflection, and the incident ray, the normal at the point of incidence and the reflected ray all lie in the same plane.
Why the other options are incorrect
Option (1) The angle of incidence is not equal to the angle of reflection. — Incorrect. This is the opposite of the first law, which says the two angles are equal.
Option (2) The incident ray, the normal to the mirror at the point of incidence and the reflected ray all lie in different planes. — Incorrect. The second law says the three lie in the same plane.
Option (4) The angle of incidence is equal to the angle of refraction. — Incorrect. Refraction is the bending of light entering another medium, where the two angles are in general not equal.