The green line of gaseous mercury at 546 rm nm falls on a
The green line of gaseous mercury at 546 {\rm nm} falls on a double-slit apparatus. If the fifth dark fringe is at 0.145{^\circ} from the centreline, what is the slit separation?
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the green line of gaseous mercury at 546 rm nm falls on a double-slit apparatus if the fifth dark fringe is at 0145circ
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