Monochromatic light with wavelength 471 nm is incident on a slit with width 0.0243 mm. The distance from the slit to a screen is 5.2 m. Consider a point on the screen 1.2 cm from the central maximum. Calculate (a) efor that point, (b) a, and (c) the ratio of the intensity at that point to the intensity at the central maximum. (a) Number n Units v (b) Number n Units v (c) Number a Units v Flying Circus of Physics Entoptic halos. If someone looks at a bright outdoor lamp in otherwise dark surroundings, the lamp appears to be surrounded by bright and dark rings (hence halos) that are actually a circular diffraction pattern as in the gure, with the central maximum overlapping the direct light from the lamp. The diffraction is produced by structures within the cornea or lens of the eye (hence entoptic). If the lamp is monochromatic at wavelength 577 nm and the first dark ring subtends angular diameter 36 in the observer's view, what is the (linear) diameter of the structure producing the diffraction? Number n Units v Current Attempt in Progress Suppose that the central diffraction envelope of a double-slit diffraction pattern contains 15 bright fringes and the first diffraction minima eliminate (are coincident with) bright fringes. How many bright fringes lie between the first and second minima of the diffraction envelope? Number Units e Textbook and Media