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Ray Optics — JEE physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceJEE physicsRay Optics1 Mark
MCQ
When a light wave goes from air into water, the quality that remains unchanged is its
  • A
    Speed
  • B
    Amplitude
  • ✓
    Frequency
  • D
    Wavelength
✓

Answer

Correct option: C.
Frequency
Let $v^{\prime}$ and $\lambda^{\prime}$ represents frequency and wavelength of light in medium respectively.so $v^{\prime}=\frac{v}{\lambda^{\prime}}=\frac{c / \mu}{\lambda / \mu}=\frac{c}{\lambda}=v$

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