Question

Figure shows a plane mirror on to which a light ray is incident. If the incident light ray is rotated by $10^\circ $ and the mirror by $20^\circ ,$ find the angle by which the reflected ray is rotated:-

• A. $30^\circ cw$
• B. $60^\circ cw$
• C. $45^\circ cw$
• D. $55^\circ cw$

Answer 1

Answer: (A)

Rotation in Reflected ray
$10^\circ +40^\circ =30^\circ $