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Wave Length

A plane wave ...

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A plane wave of wavelength 6250 A is incidentnormally on a slit of width 2 x 10-cm. The widtihof the principal maximum on a screen distant 50cm will be(a) 312.5x lor3cm (b) 312.5x 104m(c) 312.5x 10-3m (d) 3125x 10-6 cm

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