A student sets up a ray box to investigate the reflection of light from a plane mirror. The angle of incidence is 35°. What is the angle between the incident ray and the reflected ray?

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Question

A student sets up a ray box to investigate the reflection of light from a plane mirror. The angle of incidence is 35°. What is the angle between the incident ray and the reflected ray?

Accepted Answer

70° — Award 1 mark for 70°. The angle between the incident and reflected rays equals the angle of incidence plus the angle of reflection = 35° + 35° = 70°. A is incorrect — this is half the angle of incidence. B is incorrect — this is only one of the angles, not the total between the rays. C is incorrect — this confuses the angle from the surface (90° − 35° = 55°) with the answer.

Answer

35°

Answer

70°

Answer

55°

Answer

17.5°

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