l. Light waves strike a mask with two narrow slits. Spherical wavefronts emerge from each slit as if the slits were independent, in-phase oscillators. An interference pattern is formed on a screen. Draw the lines of complete constructive interference (maxima) and complete destructive interference (minima) and note the points where they intersect the screen. Write the name of each fringe ("l st max, 2nd min", etc.) next to each point. ? (.De sc 2. Suppose blue light from a He-Cd gas laser (k = 442 nm) is normally incident upon a mask. A screen is located 10 m away. The mask contains... n of O. 176 mm. How far is the third principal maximum o thin, verti slits with a center- - from the center of the screen? (0.176xl)) ...a di raction grating with 100 slits er cm. How ar IS e Irst rincipal maximum from the center of the 4009 screen? J(tom (o r is the first minimum from the center of the screen? ...a single vertical slit of width 20 m. Ho 20 X(O-C) 6)