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A ray of light is incident on 'a plane mirror at an angle of 20o....

Physics
WAEC 1999

A ray of light is incident on 'a plane mirror at an angle of 20o. This mirror is rotated through, twice this angle, In this new position the angle between the incident ray and the reflected ray is

  • A. 20o
  • B. 40o
  • C. 80o
  • D. 120o.
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Correct Answer: Option D
Explanation

GIVEN:

The angle of incidence i = 20º, Rotation of the mirror = 2 x 20º = 40º, Then the new angle of incidence i after rotation of mirror = 20º + 40º

But, angle of reflection r = angle of incidence i ( law of reflection)

Therefore, the angle between the incident ray and the reflected ray = i + r = 60º + 60º = 120º

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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
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