For a three-slit interference pattern, find the ratio of the peak intensities of a secondary maximum to a principal maximum.
Eight slits equally separated by 0.149 mm are uniformly illuminated by a monochromatic light at . What is the angular width of the central principal maximum on a screen 2.35 m away?
Light of wavelength 500 nm falls normally on 50 slits that are mm wide and spaced mm apart. How many interference fringes lie in the central peak of the diffraction pattern?