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Q.

In the given diagram a wavefront AB moving in air is incident on a plane glass surface xy. Its position CD after refraction through the glass slab is shown also along with normal drawn at A and D. The refractive index of glass will be equal to $(μ_{a i r} = 1)$

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a

$(\frac{B D}{A C})$

b

$(\frac{\cos θ}{\cos θ'})$

c

$(\frac{\sin ϕ}{\sin ϕ'})$

d

$(\frac{A B}{C D})$

answer is A, C, D.

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Detailed Solution

$A C = v t, B D = c t, μ = \frac{c}{v} = \frac{c t}{v t} = \frac{B D}{A C} μ = \frac{\sin ϕ}{\sin ϕ'} = \frac{\cos θ}{\cos θ'}$

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In the given diagram a wavefront AB moving in air is incident on a plane glass surface xy. Its position CD after refraction through the glass slab is shown also along with normal drawn at A and D. The refractive index of glass will be equal to μair=1