cse • paper_1 • waves_oscillations
[UPSC CSE 2007] Diffraction (Q271, 10M)
The radius of the first zone in a zone plate is 2\text{ mm}. What will be the position of the first image of a point source of light of wavelength \lambda = 500\text{ nm} placed at a distance of 5\text{ m} from the zone plate ?
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