30. IE ••

(a) Only a limited number of maxima can be observed with a diffraction grating. The factor(s) that limit(s) the number of maxima seen is (are)

(a) (1) the wavelength, (2) the grating spacing, (3) both. Explain.

(b) How many maxima appear when monochromatic light of wavelength 560 nm illuminates a diffraction grating that has 10 000 lines/cm, and what are their order numbers?