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A diffraction grating is made up of slits of width a with separation d. The grating...

A diffraction grating is made up of slits of width a with separation d. The grating is illuminated by monochromatic plane waves of wavelength ? at normal incidence. What is the angular width of a spectral line observed in the first order if the grating has N slits? State your answer in terms of the given variables. ??w =?

Monochromatic light with wavelength 515 nm is incident on a slit with width 0.0213 mm. The distance from the slit to a screen is 3.3 m. Consider a point on the screen 1.1 cm from the central maximum. ? = 0.19 degree for that point, calculate (a) ?, and (b) the ratio of the intensity at that point to the intensity at the central maximum.

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