A visible spectrum is incident from the water to the air water interface at an angle θ. θ is the critical angle for water to air interface when green light is incident.
Select the correct statement.
A
The entire spectrum of visible light will come out of the water at various angles to the normal.
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B
The entire spectrum of visible light will come out of the water at an angle of 90∘ to the normal.
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C
The spectrum of visible light whose frequency is less then that of green light will come out to the air medium.
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D
The spectrum of visible light whose frequency is more than that of green light will come out to the air medium.
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Solution
The correct option is C The spectrum of visible light whose frequency is less then that of green light will come out to the air medium. At critical angle, sinθ =1μ
Also, the refractive index (μ of the medium depends on the wavelength of the light. is less for the greater wavelength (i.e. lesser frequency).
so θ will be more for a lesser frequency of light. Hence the spectrum of visible light whose frequency is less than that of green light will come out the air medium.