Plane mirrors are used in which of the following instruments? (i) Light emitting diode (ii) kaleidos

JAMB Physics 2023 84 views
Source: JAMB · 2023

Plane mirrors are used in which of the following instruments?
(i) Light emitting diode
(ii) kaleidoscope
(iii) Periscope

  1. (i) and (ii) only
  2. (ii) and (iii) only ✓
  3. (i) and (iii) only
  4. All of the above
Explanation

A kaleidoscope uses plane mirrors set at an angle to make repeating patterns. A periscope uses two plane mirrors to let you see over obstacles.

A light emitting diode is a semiconductor device. It has no mirrors. So only (ii) and (iii) are correct.

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