Explain how to solve and then solve the following problems:

Problem #1 Light of 550 nm illuminates two narrow slits 0.12 mm apart causing an interference pattern on a screen 1.0 m away. How much farther did the light from the left slit travel than the light from the right slit to the m = 1 maximum on the right side of the central maximum?Problem #2 A 750 slits/mm diffraction grating is illuminated by light that gives a first-order diffraction angle of 34.0. What is the wavelength of the light