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  4. Wavelength of light in vacuum is 5890 mathringA then its wavelength in glass (μ = 1.5) will be

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Q. Wavelength of light in vacuum is 5890 $\mathring{A}$ then its wavelength in glass ($\mu = 1.5$) will be

Odisha JEEOdisha JEE 2010Ray Optics and Optical Instruments

Solution:

Given, wavelength in vacuum $=5890\, \mathring{A}$
In a medium of refractive index, the wavelength of light decreases to $ \frac{\lambda}{\mu}=\frac{5890}{1.5}=3927\, \mathring{A}$