Question

when a ray of light falls on the surface of plane mirror forms 90° angle then the reflective ray of light will be?

Answer 1

Hey mate the reflected angle would be 0°.

Answer 2

The light ray strikes the mirror normally ie at 90 degrees. The incident ray and reflected ray are both perpendicular to the surface of mirror along the normal to the mirror and are along the same path. Therefore both incident ray and reflected ray are at 0 degrees.