PhysicsJEE Main 23 Jan 2026, Shift 1·Q11·MCQ·Easy–moderate

Ray Optics · Refraction

Consider light travelling from a medium A to medium B separated by a plane interface. If the light undergoes total internal reflection during its travel from medium A to B and the speed of light in media A and B are

2.4\times10^{8}

m/s and

2.7\times10^{8}

m/s respectively, then the value of critical angle is:

(1) $\cot^{-1}\left(\dfrac{3}{\sqrt{13}}\right)$
(2) $\sin^{-1}\left(\dfrac98\right)$
(3) $\tan^{-1}\left(\dfrac{8}{\sqrt{17}}\right)$
(4) $\cos^{-1}\left(\dfrac89\right)$

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Ray Optics · Refraction

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