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Physics · PYQ NEET UG 2023
हिन्दीLight travels a distance \( x \) in time \( t_1 \) in air and \( 10x \) in time \( t_2 \) in another denser medium. What is the critical angle for this medium?
Correct answer · Option 1
\( \sin^{-1}(\frac{10t_1}{t_2}) \)
Explanation
Refractive index \( n = \frac{c}{v} = \frac{x/t_1}{10x/t_2} = \frac{t_2}{10t_1} \). The critical angle is \( \theta_c = \sin^{-1}(\frac{1}{n}) = \sin^{-1}(\frac{10t_1}{t_2}) \).
