EXERCISE 2: IRRADIANCE DUE TO N POINT SOURCES WITH A RECTANGULAR APERTURE

If instead of one point source, suppose N point sources are uniformly spaced and also arranged along a line segment of total length L that is parallel to the x-axis, as shown below.

Calculate the irradiance at the screen for the aperture of Exercise 1 if one source is on the symmetry axis, L=4.0 cm, and: (a) N=3; (b) N=11; (c) and N=101. How many distinct shadow regions (areas characterized by different irradiance) appear in each case?