A student in a Barbados secondary school used a plane mirror to investigate the reflection of light. She measured the angle between the incident ray and the mirror surface as 35°. What is the angle of reflection?

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Question

A student in a Barbados secondary school used a plane mirror to investigate the reflection of light. She measured the angle between the incident ray and the mirror surface as 35°. What is the angle of reflection?

Accepted Answer

55° — Award 1 mark for correct answer. The angle of incidence is measured from the normal, not the mirror surface. If the ray makes 35° with the surface, it makes 90° - 35° = 55° with the normal. By the law of reflection, angle of incidence equals angle of reflection, so angle of reflection = 55°. A is incorrect because it confuses the angle with the surface for the angle with the normal. C is incorrect because it doubles the surface angle. D is incorrect as 90° would mean the reflected ray travels along the normal.

Answer

70°

Answer

55°

Answer

90°

Answer

35°

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