Water is filled up to a height of 13 cm in a jar. Apparent depth of a point placed at the bottom is measured by a microscope and it found to be 10 cm. What is refractive index of water? Now water is replaced by another liquid of refractive index 1.6 up to the same height. By what distance must the microscope be moved in order to focus at the point on the bottom of jar?

Explanation

To solve the problem, we will follow these steps:

### Step 1: Find the refractive index of water
We know the formula for apparent depth (d') in terms of real depth (d) and the refractive index (n):
\[ d' = \frac{d}{n} \]
Given:
- Real depth (d) = 13 cm
- Apparent depth (d') = 10 cm
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