A beam of light of wavelength 590 nm is focused by a converging lens of diameter 10.0 cm at a distance of 20 cm from it. find the diameter of the disc image formed.

Explanation

To solve the problem of finding the diameter of the disc image formed by a converging lens, we can follow these steps:

### Step 1: Convert the Given Values
First, we need to convert the wavelength and diameter of the lens into consistent units.

- Wavelength (λ) = 590 nm = \(590 \times 10^{-9}\) m
- Diameter of the lens (D) = 10 cm = \(10 \times 10^{-2}\) m

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