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Aparallel beam of sodium lignt falls nor...

Aparallel beam of sodium lignt falls normally of a plane grating having 4240 lines per cm. A second order line is obseved at `30^(@)` to the normal. Find the wavelength. What is the highest order that can be observed with this grating? Will this line appear to be of the same colour in each order ?

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