Question

what is the value of angle of incidence and angle of reflection for normal incidence on a plane surface

Answer 1

angle of incidence=angle of reflection
in a normal plane surface.

that means
here
incidence =0 = angle of reflection
hope my answer helped you.

Answer 2

$\textbf { Hey Mate }$

your answer is ----

the value of angle of incidence and angle of reflection for normal incidence on a plane surface is zero because the light ray falling on plane surface on same time and reflect at same time .

angle of incident = angle of reflection


so , when Angle of incident is zero then angle of reflection is also zero

$\textbf {HOPE IT HELP YOU }$