CBSE Class 12 · 2024 · Geometrical OpticsMultiple Choice

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When a ray of light of wavelength and frequency is refracted into a denser medium:
  1. (A) and both increase
  2. (B) increases but is unchanged
  3. (C) decreases but is unchanged✓ Correct
  4. (D) and both decrease

Answer: (C)

Solution

On entering a denser medium the speed falls. Frequency is set by the source and does not change, so from the wavelength \emph{decreases} while stays the same.

CBSE Class 12 Board · 2024 · Single correct option

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