Ray Optics: Total Internal Reflection Condition MCQ

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Total Internal Reflection ConditionEasyQuestion 20212

Question

Total internal reflection (TIR) requires:

A
Light going from rarer to denser medium at any angle
B
Light going from denser to rarer medium at angle greater than critical angle
Correct
C
Angle of incidence equals 90°
D
Both media to have the same refractive index

Correct answer

Light going from denser to rarer medium at angle greater than critical angle

Explanation

TIR occurs when (1) light is in the denser medium (going denser → rarer) and (2) angle of incidence exceeds the critical angle θ_c = sin⁻¹(n₂/n₁). Used in optical fibres, prisms, and diamonds.

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