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

Question

Figure shows a plane mirror on to which a light ray is incident. If the incident light ray is rotated by 10° and the mirror by 20° , find the angle by which the reflected ray is rotated:- <img class="img-fluid question-image" alt="Question" src="https://cdn.tardigrade.in/q/nta/p-rmgzhov8jimsw9nf.jpg" /> (A) 30° cw (B) 60° cw (C) 45° cw (D) 55° cw

Tardigrade Admin · Accepted Answer

Rotation in Reflected ray 10° +40° =30°

Q. Figure shows a plane mirror on to which a light ray is incident. If the incident light ray is rotated by $1 0^{\circ}$ and the mirror by $2 0^{\circ},$ find the angle by which the reflected ray is rotated:-

$3 0^{\circ} c w$

$6 0^{\circ} c w$

$4 5^{\circ} c w$

$5 5^{\circ} c w$

Rotation in Reflected ray
$1 0^{\circ} + 4 0^{\circ} = 3 0^{\circ}$

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

30∘cw

60∘cw

45∘cw

55∘cw