4.7 Exercise 22

A diffraction grating with 2000 lines per centimeter is used to measure the wavelengths emitted by a hydrogen gas discharge tube. (a) At what angles will you find the maxima of the two first-order blue lines of wavelengths 410 and 434 nm? (b) The maxima of two other first-order lines are found at $\theta_{1} = 0.097 \text{rad}$ and $\theta_{2} = 0.132 \text{rad}$. What are the wavelengths of these lines?