JEE Main 2022 · 26 Jul · Shift 2 · Physics Q37

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PhysicsSingle correct+4 / -1Question 37 of 90

Light travels in two media $M_1$ and $M_2$ with speeds $1.5\times10^8$ ms $^{-1}$ and $2.0\times10^8$ ms $^{-1}$ respectively. The critical angle between them is :

\tan^{-1}\left(\dfrac3{\sqrt7}\right)

\tan^{-1}\left(\dfrac23\right)

\cos^{-1}\left(\dfrac34\right)

\sin^{-1}\left(\dfrac23\right)

Answer and worked solution

Official answer: A

Critical angle from the slower medium $M_1$ : $\sin C=\frac{v_1}{v_2}=\frac34$ , so $\tan C=\frac3{\sqrt7}$ .

(A)

Topics:Total internal reflection

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JEE Main 2022 · 26 Jul · Shift 2, Physics question 37