Assertion `:` An empty test tube dipped into water in a beaker appears silver, when viewed from a suitable direction.
Reason `:` Due to refraction of light, the substance in water appears silvery.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion.
B. If both assertion and reason are true but reason is not the correct explanation of assertion.
C. If assertion is true but reason is false.
D. If assertion and reason both are false.

Answer

C

Explanation

The ray of light incident on the water air interface suffers total internal reflections, in that case the angle of incidence is greater than the critical angle. Therefore, if the tube is viewed from suitable direction (so that the angle of incidence is greater than the critical angle ), the rays of light incident on the tube undergoes total internal reflection. As a result, the test tube appears as higly polished i.e., silvery.