1. Helium-neon laser light (λ = 632.8 nm) is sent during a 0.290 mm wide single slit. What is the width of the central maximum on a screen 2.00 m from the slit?
2. A screen is placed 48.0 cm from a single slit, which is illuminated by light of wavelength 683 nm. If the distance among the first and third minima in the diffraction pattern is 3.20 mm, what is the width of the slit?