Describe how monochromatic light diffracts as it goes through a diffraction grating.
White light is incident on a diffraction grating, as shown in Fig. 4.1. Describe, using the principle of superposition, how white light at the zero order is explained.
Describe how the principle of superposition explains why red and blue light appear at different positions in the first-order spectrum.
A light wave with wavelength $625\\,\\text{nm}$ gives a second-order maximum at $61.0^\\circ$ to the incident direction. Determine the number of lines per metre of the diffraction grating.
Calculate the wavelength of another visible part of the spectrum that gives a maximum in a different order at the same angle as in (ii).
A light wave of wavelength $625\\,\\text{nm}$ gives a second-order maximum at an angle of $61.0^\\circ$ to the incident direction. Determine the number of lines per metre of the diffraction grating.
Calculate the wavelength of another visible part of the spectrum that produces a maximum for a different order at the same angle as in (ii).