Question

A ray of light enters a spherical drop of water of refractive index $\mu$ as shown in fig. Select the correct statement(s).

• A. Incident rays are partially reflected at point A
• B. Incident rays are totally reflected at point A
• C. Incident rays are totally transmitted through A
• D. None of these

Answer 1

The correct option is C Incident rays are totally transmitted through A

From Snell's law:

$\mu \sin \alpha =\sin \varphi$

$\sin \alpha =\frac{1}{\mu }\times \sin \varphi$

$0<\sin \varphi <1$

$\frac{\sin \varphi }{\mu }<\frac{1}{\mu }$

$\alpha$ is less than critical angle.

So incident rays are totally transmitted through A.

Hence option 'C' is correct.