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Two spectral lines of sodium D(1) and D(...

Two spectral lines of sodium `D_(1)` and `D_(2)` have wavelengths of approximately 5890 Å and 5896 Å. A sodium lamp sends incident plane wave onto a slit of width 2 micrometre. A screen is located 2 m from the slit. Find the spacing between the first maxima of two sodium lines as measured on the screen.

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SL ARORA-WAVE OPTICS-Based on Intensity Distribution in interference pattern
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