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JAMB Physics 2002 Question 16

Question 16

Refraction of Light

A ray of light which strikes a glass slab from air at normal incidence passes through the slab

  1. A.deviated and undisplaced at a lower speed
  2. B.undeviated and displaced at a faster speed
  3. C.undeviated and undisplaced at a lower speed
  4. D.deviated and displaced at a lower speed
Show the answer and explanation

Answer: C (undeviated and undisplaced at a lower speed)

Explanation

At normal incidence the ray does not bend, so it goes straight through without deviation or sideways displacement; it travels more slowly in glass.