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A monochromatic light beam of frequency ...

A monochromatic light beam of frequency `6.0xx10^14 Hz` crosses from air into a transparent material where its wavelength is measured to be `300 nm.` What is the index of refraction of the material?

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The correct Answer is:
A
`mu=c/v=c/(f lambda)=(3xx10^8)/(6xx10^14xx300xx10^-9)=1.67`
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