Question

There is a small air bubble at the center of a solid glass sphere of radius $r$ and refractive index $\mu$. What will be the apparent distance of the bubble from the centre of the sphere, when viewed from outside?

• A. $r$
• B. $\frac{r}{\mu}$
• C. $r(r - \frac{1}{\mu})$
• D. 0

Answer 1

Answer: (D)

0

Answer 2

As the object is at centre of the sphere. $\therefore$ All rays will fall normally on surface, hence they do not deflect.

Thus, a virtual image is formed at the centre $O$.

$\therefore$ Apparent depth = Real depth