MHT CET 2024 Physics question

For a ray of light, the critical angle is minimum, when it travels from

(A)glass to airCorrect
(B)air to glass
(C)glass to water
(D)water to glass

Answer: (A)

Solution

Total internal reflection, and hence a critical angle, occurs only when light passes from a denser to a rarer medium, with . The critical angle is smallest when this ratio is smallest. Glass to air: $ C =

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Question ID VK-098881