cse • paper_1 • waves_oscillationscse-1988-subject-02-006
Fresnel zone plate — UPSC CSE 1988 Physics PYQ
Buy PYQ Solution Manual →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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