The threshold wavelength of tungsten is `2400 Å` when tungsten is illuminated with light of wavelength `1600 Å`. Find
(i) work function
(ii) maximum KE of emitted electron
(iii) stopping potential
(b) Draw a labelled diagram of an image formed by a compound microscope, with the image at least distance of distinct vision. Write any one expression for its magnifying power.

Explanation

To solve the given problem step by step, we will address each part of the question systematically.

### Given Data:
- Threshold wavelength of tungsten, \( \lambda_0 = 2400 \, \text{Å} = 2400 \times 10^{-10} \, \text{m} \)
- Wavelength of incident light, \( \lambda = 1600 \, \text{Å} = 1600 \times 10^{-10} \, \text{m} \)
- Planck's constant, \( h = 6.63 \times 10^{-34} \, \text{Js} \)
- Speed of light, \( c = 3 \times 10^8 \, \text{m/s} \)
- Charge of an electron, \( e = 1.6 \times 10^{-19} \, \text{C} \)
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