1. A laser with λ = 532 nm is passed through a diffraction grating. The first-order maximum is observed at θ= 25o. What is the spacing, d, between the slits? How many slits are there per mm?
2. Calculate the wavelength of the emitted photon from hydrogen for the transition from ni = 3 to nf = 2. What part of the visible spectrum is this wavelength? Visible wavelengths are: Red ≈ 700 - 620 nm, Yellow ≈ 620 - 560 nm, Green ≈ 560 - 500 nm, Blue ≈ 500 - 440 nm, and Violet ≈ 440 - 400 nm.