A glass convex lens of refractive index `3/2` has got a focal length equal to 0.3 m. Find the focal length of the lens if it is immersed in water of refractive index` 4//3`.

Explanation

To find the focal length of a glass convex lens when it is immersed in water, we can use the lens maker's formula. Let's break down the solution step by step.

### Step 1: Understand the Lens Maker's Formula
The lens maker's formula is given by:

\[ \frac{1}{f} = \left( \mu_{lens} - 1 \right) \left( \frac{1}{R_1} - \frac{1}{R_2} \right) \]
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