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A beam of monochromatic light is refracted from vacuum into a medium of refractive index 1.5. The wavelength of refracted light will be
(a) Dependent on intensity of refracted light
(b) Same
(c) Smaller
(d) Larger
(c)
From
Here, c = velocity of light in medium and
v = velocity of light in vacuum;
m = refractive index of the medium.
Hence, wavelength in medium (lm) < la
(‘.’ m > 1, given)
So, the required wavelength decreases.
ALTERNATIVELY,
c = vl . On refraction, the frequency, v do not change. When light is refracted from vacuum to a medium, the velocity, c decreases. Therefore, l also decreases.
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