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The speed of light in media ‘A’ and ‘B’ are 2.0 × 10 10 cm/s and 1.5 × 10 10 cm/s respectively. A ray of light enters from the medium B to A at an incident angle ‘ θ ’. If the ray suffers total internal reflection, then

1. θ = sin –1 ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ 4 3
2. θ > sin –1 ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ 3 2
3. θ < sin –1 ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ 4 3
4. θ > sin –1 ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ 4 3

Correct answer: θ > sin –1 ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ 4 3

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