Question

With a fixed incident ray , if a plane mirror is rotated through an angle of 20° about an axis lying perpendicular to its plane , then the reflected ray turns through an angle

a) 0°
b) 20°
c) 30°
d) 40°​

Answer 1

Answer:

Option (c) - 30

Explanation:

Answer 2

The reflected ray turns through an angle 40°

Therefore, option (d) is correct.

Explanation:

Without going into derivation, it is known that if a plane mirror is rotated through an angle θ about an axis lying perpendicular to its plane then the reflected ray is rotated by an angle 2θ.

According to the question, the mirror is rotated by an angle 20°, therefore the reflected ray will be rotated by an angle 2 × 20° = 40°.

Hope this answer is helpful.

Know More:

Q: Keeping the incident ray fixed, if a plane mirror is rotated through an angle theta about an axis lying in its plane, then the reflected ray turns through an angle​:

Know Here: https://brainly.in/question/16685304