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NDA 2019 GAT · General Knowledge · Light and Optics · medium

Two plane mirrors are placed at right angles to each other and an object is kept between them. The number of images formed is

Single correct option

Two plane mirrors are placed at right angles to each other and an object is kept between them. The number of images formed is
  1. A. 3
  2. B. 2
  3. C. 4
  4. D. 5
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Answer: (A) 3

The number of images is (360/theta) - 1 = (360/90) - 1 = 3 for an even value of 360/theta. Two images are formed by single reflections and the third is formed by reflection in both mirrors.
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Original question written in the NDA 2019 GAT pattern and checked twice for the correct answer. Not an official question paper. How we write and check questions · Corrections policy · Report a mistake