cse โข paper_1 โข waves_oscillations
[UPSC CSE 1988] Diffraction (Q305, 20M)
The diameter of the central zone of a zone-plate is 2.3\text{ mm}. If a point source of light (\lambda=589.3\text{ nanometer}) is placed at a distance of 6\text{ metre} from it, calculate the position of the first image.
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