Question

what happened to a ray of light that falls on a mirror at right angles?

Answer 1

Angle of incidence is angle made by incident ray with normal. Normal is perpendicular drawn to surface of mirror or lens.

If light fall perpendicular on plane mirror, angle made by light with normal is zero i.e. angle of incidence is zero. Since angle of incidence is equal to angle of reflection, angle of reflection is also zero.

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Answer 2

Answer:

If light fall perpendicular on plane mirror, angle made by light with normal is zero i.e. angle of incidence is zero. Since angle of incidence is equal to angle of reflection, angle of reflection is also zero

Explanation:

If light fall perpendicular on plane mirror, angle made by light with normal is zero i.e. angle of incidence is zero. Since angle of incidence is equal to angle of reflection, angle of reflection is also zero