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In the diagram above, an incident ray AY makes an angle of 30o with the...

Physics
WAEC 2000

In the diagram above, an incident ray AY makes an angle of 30o with the normal XY. If the mirror is rotated anticlockwise about Y through an angle of 20o, while AY is fixed, what angle will the reflected ray now make with the incident ray?

  • A. 70o
  • B. 80o
  • C. 100o
  • D. 120o
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Correct Answer: Option C
Explanation

The reflected ray will rotate through angle 2 x 20º = 40º

The reflected ray will now make angle 30º + 30º + 40º = 100º with the incident ray(30º + 30º since i = r)

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