Physics (AS & A Level) · May / June 2020 · Paper 13 · Question 30

Light of a single wavelength from a distant point source falls normally onto a diffraction grating positioned with its lines vertical. The plane of the diffraction grating is at right angles to the incident light. A student looks at the grating from a position near to the grating. What could the student see?

1. Aa central point source with a series of point source images on either side
2. Ba central vertical line with a series of spectra on either side
3. Ca series of fine vertical lines
4. Da single point source

As printed in the paper