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Question
A monochromatic beam of light of wavelength λ passes from air into a glass block. Write an expression to show the relation between the speed of light in air and the speed of light in glass.
Short Answer
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Solution
If c is the speed of light in air and v is the speed of light in glass, then
\[ \mu=\frac{c}{v} \]
where μ is the refractive index of glass with respect to air.
Hence,
c = μv
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Chapter 2: Light - Frequently Asked Questions in Board Examination [Page 152]
