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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



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


Grade:10

1 Answers

Amit Saxena
35 Points
8 years ago

(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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