JEE Main 2022 · 25 Jun · Shift 1 · Physics Q49

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PhysicsSingle correct+4 / -1Question 49 of 90

The difference of speed of light in the two media A and B $(v_A-v_B)$ is $2.6\times10^7$ m/s. If the refractive index of medium B is 1.47, then the ratio of refractive index of medium B to medium A is : (Given : speed of light in vacuum $c=3\times10^8\ \mathrm{ms^{-1}}$ )

1.303

1.318

1.13

0.12

Answer and worked solution

Official answer: C

Speeds. $v_B=\dfrac{3\times10^8}{1.47}\approx2.041\times10^8$ , so $v_A\approx2.301\times10^8$ m s $^{-1}$ and $n_A\approx1.304$ .

Ratio. $\dfrac{n_B}{n_A}=\dfrac{1.47}{1.304}\approx1.13$ .

(C)

Topics:Refraction at plane surfaces

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JEE Main 2022 · 25 Jun · Shift 1, Physics question 49