Two medium I & II are separated by a plane surface having speed of light 2 × 1 0 8 m / s and 2.4 × 1 0 8 m / s respectively. What is the critical angle for a ray going from I medium to II ?

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sin r = n D ​ n R ​ ​ = ( C / v D ​ ) ( C / v R ​ ) ​ = v R ​ v D ​ ​ = 2.4 × 1 0 8 2 × 1 0 8 ​ = 6 5 ​ v D ​ & v R ​ : Velocity of light in denser & rarer medium respectively.

Physics - Geometrical Optics Question with Solution | TestHub

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JEE Main (2028)

JEE Main - 1 year (12th class)