A plane convex lens has a focal length 12cm and is made up of glass with refractive index 1.5. Find the radius of curvature of its curved side.

Explanation

To solve the problem of finding the radius of curvature of the curved side of a plane convex lens with a focal length of 12 cm and a refractive index of 1.5, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Lens**:
- A plane convex lens has one flat surface and one curved surface. The curved surface will have a radius of curvature, which we will denote as \( R_1 \). The flat surface can be considered to have an infinite radius of curvature, denoted as \( R_2 = \infty \).

2. **Using the Lens Maker's Formula**:
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