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  4. A ray of light of wavelength 720 nm is refracted into a medium of refractive index 1.5. The wavelength of light in the medium is

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Q. A ray of light of wavelength 720 nm is refracted into a medium of refractive index 1.5. The wavelength of light in the medium is

Ray Optics and Optical Instruments

Solution:

$n=\frac{c}{v}=\frac{v\,\lambda_0}{v\,\lambda}$
$Hence \,\lambda=\frac{\lambda_0}{n}=\frac{720}{1.5}=480\,nm$