STANDARDPhysics-Optics
STANDARD Physics Critical Angle and Total Internal Reflection MCQ Question
Type: MCQ-numerical-Medium-Class 12
Light travels in two media A and B with speeds 1.8 × 10⁸ m s⁻¹ and 2.4 × 10⁸ m s⁻¹ respectively. Then the critical angle between them is
A
sin⁻¹(2/3)
B
tan⁻¹(3/4)
C
tan⁻¹(2/3)
D
sin⁻¹(3/4)
Correct Answer
Option D
Detailed Explanation
The critical angle C is given by sin C = vA/vB. Substituting the given values, sin C = 1.8 × 10⁸ / 2.4 × 10⁸ = 3/4. Therefore, C = sin⁻¹(3/4).
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