The interference pattern shown in Figure 28-45 (a) is produced by green light with a wavelength of = 505 nm passing through two slits

The interference pattern shown in Figure 28-45 (a) is produced by green light with a wavelength of λ = 505 nm passing through two slits with a separation of 127 mm. After passing through the slits, the light forms a pattern of bright and dark spots on a screen located 1.25 m from the slits.

(a) What is the distance between the two vertical, dashed lines in Figure 28-45 (a)?

(b) If it is desired to produce a more tightly packed interference pattern, like the one shown in Figure 28-45 (b), should the frequency of the light be increased or decreased? Explain.

In figure 28-45

(a) (b)