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Q.

Number of waves in a length l traversed by a mono chromatic light in vacuum is 106. When the same length of path is traversed by the same light in a medium other than vacuum, number of waves is 3×106. When the same light travelling in vacuum, strikes the vacuum-medium interface at an angle of incidence 60o, after refraction, the ray will deviate through an angle of

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a

30o

b

45o

c

15o

d

25o

answer is A.

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Detailed Solution

In vacuum, l=n1λ, In the medium, μl=n2λ∴ μ=n2n1=3×106106=3Now sinr=siniμ=sin60o3=12⇒r=30o∴ δ=i−r=60o−30o=30o
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Number of waves in a length l traversed by a mono chromatic light in vacuum is 106. When the same length of path is traversed by the same light in a medium other than vacuum, number of waves is 3×106. When the same light travelling in vacuum, strikes the vacuum-medium interface at an angle of incidence 60o, after refraction, the ray will deviate through an angle of