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when laser light of wavelength Iemdba falls on a metal scale with 1mm engravings at a grazing angle of incidences, it is diffracted to

when laser light of wavelength Iemdba falls on a metal scale with 1mm engravings at a grazing angle of incidences, it is diffracted to form a vertical chain of diffracted spots on a screen kept lar to the scale. If the wavelength of the laser is increased by 200nm, the angle of the first-order diffraction spot changes from 5 to.

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