Question

The diagram shows a spectrometer being used to analyze a sample of a solution.

An illustration of an incandescent light bulb shining on a concave lens labeled W, the converging rays strike a prism labeled X that breaks the light into a rainbow that strikes a surface that allows the yellow light through striking a graduated cylinder labeled Y with a clear liquid. The yellow light then strikes a surface labeled Z.
Which letter represents the diffraction grating?

W
X
Y
Z

Answer 1

X — it's the dispersive element that spreads the white light into a spectrum (the diffraction grating/prism).