CUET · PHYSICS · PYQ PAPER 2023
The critical angle of a medium for a specific wavelength, if the medium has relative permittivity 3 and relative permeability \( \frac{4}{3} \) for this wavelength, will be :
- A \( 15^\circ \)
- B \( 30^\circ \)
- C \( 45^\circ \)
- D \( 60^\circ \)
Answer & Solution
Correct Answer
(B) \( 30^\circ \)
Step-by-step Solution
Detailed explanation
\( n = \sqrt{\epsilon_r \mu_r} \) \( n = \sqrt{3 \times \frac{4}{3}} = 2 \) \( \sin(\theta_c) = \frac{1}{n} \) \( \sin(\theta_c) = \frac{1}{2} \) \( \theta_c = 30^\circ \)
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