Two plane mirrors are inclined at an angle 20° to each other. Determine the number of images formed when an object is placed between them.

  • A 17
  • B 18
  • C 19
  • D 20
waec 2017physics

The correct answer is A. 17

The number of images formed = \(\frac{360}{n}\) where the value gotten is odd

else, = \(\frac{360}{n} -1\).

Solving, we have that \(\frac{360}{20} = 18\)

Hence, the no of images formed is 18 - 1 = 17.

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