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JAMB Physics 1999 Question 33

Question 33

Refraction of Light

The diagram above shows the prism arrangement in a

Diagram for this question
  1. A.binocular
  2. B.spectrometer
  3. C.periscope
  4. D.projector.
Show the answer and explanation

Answer: C (periscope)

Explanation

Two right-angled prisms each turn the light through 90° by total internal reflection, so light entering at the top leaves lower down in the same direction: a periscope.