in the image above, an incident ray XY makes an angle of ...
in the image above, an incident ray XY makes an angle of 15∘ with a fixed line AY which is normal to surface of a plane mirror if the mirroe is turned as indicated by the arrow through 40∘ what angle will the reflected ray make with AY
A.
25∘
B.
40∘
C.
15∘
D.
55∘
E.
95∘
Correct answer is E
incident ray = XY
incidence angle i = 15∘
rotation angle θ = 40º
angle that the reflected ray make with AY = i + 2θ
= 15 + [2 * 40] = 15 + 80 = 95º