a grating-based spectroscope, if half of grating slits are blocked, it will not affect - Spectrum resolving power. . Intensity of spectrum lines. . The angle of grating diffraction fringes. . Free spectrum range.

3.Which wavelength range does the green line of the mercury lamp belong to: 600-700 nm, 500-600 nm, or 400-500 nm, or 300-400nm?

Discuss the single slit diffraction pattern.

10. Light of wavelength 520 nm passes through a grating with 4000 lines/cm and falls on a screen located 1.6 m from the grating. (a) Draw a picture (not to scale) that schematically represents the process and label all known distances and angles. (b) Determine the angular deflection of the second bright band. (c) Determine the separation of the 2nd order bright spot from the central maximum. (d) Determine the total number of constructively interfering beams that are formed after the light passes the grating.