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Q.

Monochromatic light is refracted from air into glass of refractive index μ. The ratio of the wavelengths of the incident and refracted waves is

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a

1 : μ

b

μ2: 1

c

1 : 1

d

μ : 1

answer is C.

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Detailed Solution

va=νλa    and  vg=νλg.  ⇒λa λg=vavg But  vavg=μ ∴  λa λg=μ

Hence, the ratio of the wavelengths of the incident and refracted waves is μ : 1.

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