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Question

A red colour light of wavelength 760 nm is observed to pass from air to an unknown medium. If the wavelength of light in unknown medium becomes 570 nm, the unknown medium is

A
optical denser
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B
optical rarer
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C
same as initial medium
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D
Data insufficient
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Solution

The correct option is A optical denser
Refractive index, μ=λvaccumλmedium
μ1λ
λ1=760 nm, λ2=570 nm
λ1>λ2
or, μ2>μ1
Thus, unknown medium is optical denser.
Tips: Relate Snell's law with the wave properties (v,λ) of light.

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