Question 11 — Suppose you are given - Questions at the end of the chapter - Chapter 11 Class 7 - Light: Shadows and Reflections (Curiosity)

Last updated at June 19, 2026 by

Q 11
Question

Suppose you are given a tube of the shape shown in the Fig. 11.20 and two plane mirrors smaller than the diameter of the tube. Can this tube be used to make a periscope? If yes, mark where you will fix the plane mirrors.

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Answer
Yes, fix one mirror at each bend of the tube to make a periscope.

Explanation

  • A periscope needs two plane mirrors at the two bends.
  • Fix one mirror at the top bend at an angle.
  • Fix the other mirror at the bottom bend, parallel to the first.
  • Light then reflects down the tube to the eye.
Two mirrors at the bends turn the tube into a periscope.
← Back to concept: 11.8.1 Periscope
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