9702 · 8.2
Practice and worked examples for 9702 Diffraction. Short previews only — attempt the full question in MarkScheme against the official scheme.
Monochromatic light of wavelength 550 nm is incident normally on a diffraction grating that has 400 lines per mm. Calculate the angle of the second-order maximum.
The angle of the second-order maximum is $26.1^{\circ}
A beam of red light with a wavelength of 680 nm is directed at a diffraction grating. The first-order maximum is observed at an angle of $19.5^{\circ} (a) Calculate the slit spacing of the grating. (b) Determine the total number of maxima that can be observed.
(a) The slit spacing is $2.04 \times 10^{-6} (b) The highest order is . The total number of maxima that can be observed is 5.