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Q: A beam of white light undergoes dispersion though a triangular glass prism forming a band of seven colours. Which of the statements is/are correct? (1) The red-coloured component has minimum refractive index (2) The violet-coloured component deviates the least. (3) All components of white light have same speed in glass.
  • A. Both (2) and (3)
  • B. Both (1) and (2)
  • C. Only (2)
  • D. Only (1)
Correct Answer: Option D - A beam of white light undergoes dispersion though a triangular glass prism forming a band of seven colours. The red coloured compound has minimum refractive index.
D. A beam of white light undergoes dispersion though a triangular glass prism forming a band of seven colours. The red coloured compound has minimum refractive index.

Explanations:

A beam of white light undergoes dispersion though a triangular glass prism forming a band of seven colours. The red coloured compound has minimum refractive index.