(a) A plane wave is incident normally on a straight edge (see Fig. 20.24). Show that the f...

(a) A plane wave is incident normally on a straight edge (see Fig. 20.24). Show that the field at an arbitrary point P is given by

where .

(b) Assume λ0 = 5000 Å and d = 100 cm. Write approximately the values of I/I0 at the points O, P (y = 0.5 mm), Q (y = 1 mm) and R (y = -1 mm) where O is at the edge of the geometrical shadow.