Focal length of a convex lense in air is `10cm`. Find its focal
length in water. Given that `mu_g=3//2` and `mu_w=4//3`.

Explanation

To find the focal length of a convex lens in water when its focal length in air is given, we can use the formula that relates the focal lengths in different media based on their refractive indices. Here’s a step-by-step solution:

### Step 1: Write down the known values
- Focal length of the lens in air, \( f_{\text{air}} = 10 \, \text{cm} \)
- Refractive index of glass, \( \mu_g = \frac{3}{2} \)
- Refractive index of water, \( \mu_w = \frac{4}{3} \)

### Step 2: Use the lens maker's formula
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