1.

Light of wavelength 6328 A is incident normally on a slit having a width of 0.2 mm. The width of the central maximum measured from minimum to minimum of diffraction pattern on a screen 9 m away will be nearly(1) 0.36 degree(3) 0.72 degree(2) 0.18 degree(4) 0.09 degree​

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ANSWER:

.72 degree

Explanation:

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