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JAMB Physics 1980 Question 14

Question 14

Refraction of Light

The diagram in the above figure shows the prism arrangement in a

Diagram for this question
  1. A.microscope
  2. B.stereoscope
  3. C.projector
  4. D.periscope
  5. E.gyroscope
Show the answer and explanation

Answer: D (periscope)

Explanation

Two right-angled prisms turn the light through 90° twice, so it comes out parallel to its original direction but at a different level: this is a prism periscope.