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JEE Mains · Physics · STD 12 - 9. Ray optics and optical instruments
Light is incident from a medium into air at two possible angles of incidence \((A)\, 20^o\) and \((B)\, 40^o\) . In the medium light travels \(3.0\, cm\) in \(0.2\, ns\). The ray will
- A suffer total internal reflection in both cases \((A)\) and \((B)\)
- B suffer total internal reflection in case \((B)\) only
- C have partial reflection and partial transmission in case \((B)\)
- D have \(100\%\) transmission in case \((A)\)
Answer & Solution
Correct Answer
(B) suffer total internal reflection in case \((B)\) only
Step-by-step Solution
Detailed explanation
Velocity of light in medium \({V_{{\text{treat }}}} = \frac{{3\,{\text{cm}}}}{{0.2\,{\text{ns}}}} = \) \(\frac{{3 \times {{10}^{ - 2}}{\text{m}}}}{{0.2 \times {{10}^{ - 9}}{\text{s}}}} = 1.5\,{\text{m}}/{\text{s}}\) Refractive index of the medium…
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