Physics · May / June 2023 · Paper 11 · Question 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. The mirror is rotated until the light is reflected back along its original path. Through which angle is the mirror rotated?
- A22.5° clockwise
- B22.5° anticlockwise
- C45° clockwise
- D45° anticlockwise
As printed in the paper
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Correct answer: C. 45° clockwise
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