A double convex lens is made of glass of refractive index `1.55` with both faces of same radius of curvature. Find the radius of curvature required, if focal length is `20 cm`.

Explanation

To find the radius of curvature required for a double convex lens made of glass with a refractive index of 1.55 and a focal length of 20 cm, we can use the lens maker's formula. The lens maker's formula is given by:

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

Where:
- \( f \) is the focal length of the lens,
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