A convex lens of focal length 0.24 m and of refractive index 1.5 is completely immersed in water of refractive index 1.33. Find the change in focal length of the lens.

Explanation

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

### Step 1: Understand the lens maker's formula
The lens maker's formula is given by:
\[ \frac{1}{f} = \left( \mu - 1 \right) \left( \frac{1}{R_1} - \frac{1}{R_2} \right) \]
where:
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