Find the refractive index of the material of a plano-convex lens, if the radius of curvature of the convex surface is 20 cm and focal length of the lens is 60 cm?

Explanation

To find the refractive index of the material of a plano-convex lens, we can use the lens maker's formula. Here's a step-by-step solution:

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