Find the focal length of a double-convex lens with `R_(1) = 15cm` and `R_(2) = -25CM`. The refractive index of the lens material `n = 1.5`

Explanation

To find the focal length of a double-convex lens using the given values, we will apply the lens maker's formula:

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

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