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Question 11Asked in RRB JE CBT-1, 19 Feb 2026, Shift 3 (4:30 PM)

A scientist wants to demonstrate that dispersion depends on wavelength. She shines

A scientist wants to demonstrate that dispersion depends on wavelength. She shines monochromatic red light through a prism. What does she observe and why?
  1. AOnly a single red ray emerges; no spectrum forms because there is only one wavelength
  2. BRed light is absorbed, so nothing emerges
  3. CMultiple red rays emerge, each at a different angle
  4. DA full spectrum appears, showing all colors
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Correct answer: (A) Only a single red ray emerges; no spectrum forms because there is only one wavelength

From RRB JE CBT-1 PYQ 19 Feb 2026, Shift 3 (4:30 PM)

This is question 11 of RRB JE CBT-1 PYQ 19 Feb 2026, Shift 3 (4:30 PM). See all questions of this paper with answers, or attempt the paper as a timed online test to get your score and all-India rank.