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  4. When a ray of light enters into water from air, then its wavelength :

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Q. When a ray of light enters into water from air, then its wavelength :

Rajasthan PMTRajasthan PMT 1997

Solution:

Wavelength $ \lambda =\frac{\upsilon }{n} $ When a light ray enters into water from air, the frequency (n) is unchanged but velocity (v) decreases. $ \therefore $ $ \lambda $ decrease.