Question 151: Ray Optics

Question

A microscope is focused on an object at the bottom of a bucket. If liquid with refractive index $\frac{5}{3}$

is poured inside the bucket, then the microscope has to be raised by $30 \mathrm{~cm}$ to focus the object again.

The height of the liquid in the bucket is :

Accepted Answer

Shift $=\left(d-\frac{d}{\mu}ight)=30 \mathrm{~cm}$
$$
\begin{aligned}
& \Rightarrow d\left[1-\frac{1}{\frac{5}{3}}ight]=30 \\
& \Rightarrow d=\frac{30 	imes 5}{2}=75 \mathrm{~cm}
\end{aligned}
$$

Answer

$50 \mathrm{~cm}$

Answer

$18 \mathrm{~cm}$

Answer

$75 \mathrm{~cm}$

Answer

$12 \mathrm{~cm}$

Ray Optics

A microscope is focused on an object at the bottom of a bucket. If liquid with refractive index \frac{5}{3} is poured inside the bucket, then the microscope has to be raised by 30 \mathrm{~cm} to focus the object again. The height of the liquid in the bucket is :

Choose the correct answer: