Question text
20 Light is incident on a mirror at an angle of 45° as shown. The mirror can be rotated about an axis into the page through point X. X 45° The mirror is rotated until the light is reflected back along its original path. Through which angle is the mirror rotated? A 22.5° clockwise B 22.5° anticlockwise C 45° clockwise D 45° anticlockwise
20 Light is incident on a mirror at an angle of 45° as shown. The mirror can be rotated about an axis
into the page through point X.
X
45°
The mirror is rotated until the light is reflected back along its original path.
Through which angle is the mirror rotated?
A 22.5° clockwise
B 22.5° anticlockwise
C 45° clockwise
D 45° anticlockwise
Select your answer: