When green light ( = 505 nm) passes through a pair of double slits, the interference pattern

When green light (λ = 505 nm) passes through a pair of double slits, the interference pattern shown in FIGURE 28-45 (a) is observed. When light of a different color passes through the same pair of slits, the pattern shown in FIGURE 28-45 (b) is observed.

(a) Is the wavelength of the second color longer or shorter than 505 nm? Explain.

(b) Find the wavelength of the second color. (Assume that the angles involved are small enough to set sin θ ≈ tan θ.)

In figure 28-45

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(a) (b)