Question

If a ray of light passes from a denser medium to a rarer medium in a straight line, the angle of incident must be ______.

Options

• 0°

• 30°

• 60°

• 90°

Answer 1

If a ray of light passes from a denser medium to a rarer medium in a straight line, the angle of incident must be 0°.

Explanation:

Because if the ray goes from denser to rarer in a straight line (no bending), it must strike the boundary normally, so the angle of incidence = 0°.