7. ••

(a) If the wavelength used in a double-slit experiment is decreased, the distance between adjacent maxima will (1) increase, (2) decrease, (3) remain the same. Explain.

(b) If the separation between the two slits is 0.20 mm and the adjacent maxima of the interference pattern on a screen 1.5 m away from the slits are 0.45 cm apart, what is the wavelength and color of the light?

(c) If the wavelength is 550 nm, what is the distance between adjacent maxima?