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 microscope have to be raised by $30\, cm$ to focus the object again The height of the liquid in the bucket is :

• A. 12cm
• B. 18cm
• C. 50cm
• D. 75cm

Answer 1

Answer: (D)

75cm

Answer 2

$d=\frac{30×5}{2}=75 cm$
So , the correct answer is (D) : 75 cm