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JAMB Physics 2010 Question 32

Question 32

Dispersion of Light and Colours

Dispersion occurs when white light passes through a glass prism because of the

  1. A.different speeds of the colours in the glass.
  2. B.high density of the glass.
  3. C.defects in the glass.
  4. D.different hidden colours in the glass.
Show the answer and explanation

Answer: A (different speeds of the colours in the glass.)

Explanation

Each colour travels at a slightly different speed in glass, so each is refracted by a different amount and white light spreads into a spectrum.