COMEDK · Physics · 25. Ray Optics
Two light rays A and B travel from a medium into air at angles of incidence 15 degrees and 42 degrees respectively. In the medium, light travels 3 cm in 0.2 ns . Will there be total internal reflection? If so, which ray?
- A Yes, Both A and B
- B Yes, B
- C No
- D Yes, A
Answer & Solution
Correct Answer
(B) Yes, B
Step-by-step Solution
Detailed explanation
The speed of light in the medium is \(v = \dfrac{d}{t} = \dfrac{3 \times 10^{-2} \text{ m}}{0.2 \times 10^{-9} \text{ s}} = 1.5 \times 10^{8} \text{ m/s}\). The refractive index of the medium is \(n = \dfrac{c}{v} = \dfrac{3 \times 10^{8}}{1.5 \times 10^{8}} = 2\). The critical…
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