What is a diffraction grating?
A) flat, rectangular array of closely spaced photosensitive cells
B) piece of glass with thousands of closely spaced, parallel grooves
C) array of many radio telescopes used to observe a single source simultaneously
D) triangular prism of solid glass used to disperse light into its colors

Question

Quizplus · Accepted Answer

A diffraction grating is a piece of glass (or other transparent material) that has thousands of closely spaced, parallel grooves on its surface. These grooves diffract light into several beams traveling in different directions. The angles of these beams depend on the spacing of the grooves and the wavelength of the light, making diffraction gratings useful for dispersing light into its component colors and for measuring wavelengths.

What Is a Diffraction Grating