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O-LevelPhysicsLight5054/11 · Oct/Nov 2016 · Q231 Mark

The angle of incidence of ray OP on the plane mirror MN is 40°. The mirror is rotated through 10°, as shown by the dashed line. The direction of the incident ray OP does not change. What is the new angle of incidence?

Diagram for this question, from the exam paper

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A30°

B40°

C50°

D60°

✓ Correct answer

C: 50°

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About this question

Topic: Light, O-Level Physics (syllabus 5054). Multiple choice, 1 mark.
Source: O-Level Physics, Oct/Nov 2016 Paper 1 Variant 1, question 23.

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