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A beam of monochromatic light is refracted fromvacuum into a medium of refractive index 1.5,the wavelength of refracted light will be (1991]
  • a)
    dependent on intensity of refracted light
  • b)
    same
  • c)
    smaller
  • d)
    larger
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
A beam of monochromatic light is refracted fromvacuum into a medium of...
Here, c = velocity of light in medium and v =
velocity of light in vacuum;
m = refractive index of the medium.
Hence, wavelength in medium 
(∴ μ > 1, given)
So, the required wavelength decreases.
ALTERNATIVELY,
c =vλ . On refraction, the frequency, v do
not change. When light is refracted from
vacuum to a medium, the velocity, c
decreases. Therefore,  λ also decreases
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