COMEDK · Physics · 25. Ray Optics
If a clear liquid has a refractive index of 1.45 and a transparent solid has a refractive index of 2.9, then for total internal reflection to occur at the interface between the two media; which of the following is correct?
- A The ray must travel from transparent solid to liquid at an angle of 15°
- B The ray must travel from liquid to transparent solid at an angle of 45°
- C The ray must travel from transparent solid to liquid at an angle of 30°
- D The ray must travel from liquid to transparent solid at an angle of 60°
Answer & Solution
Correct Answer
(C) The ray must travel from transparent solid to liquid at an angle of 30°
Step-by-step Solution
Detailed explanation
For total internal reflection to occur, light must travel from an optically denser medium to an optically rarer medium. The refractive index of the transparent solid is \(\mu_1 = 2.9\) and that of the clear liquid is \(\mu_2 = 1.45\). Since \(\mu_1 > \mu_2\), the solid is the…
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