In a double-slit set-up

PHYSICS · Subjective · CBSE · Physics · Wave Optics · Wave Optics

Problem

In a double-slit set-up, the slits are 0.25 mm0.25\,\text{mm} apart and the screen is 1.5 m1.5\,\text{m} away. Light of wavelength 500 nm500\,\text{nm} is used. A point 3.0 mm3.0\,\text{mm} above the central bright fringe is observed on the screen. Determine (i) whether this point is bright or dark and (ii) the order of that fringe.

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