Q.

Which one of the following instruments is used to study dispersion of light?

A. Microscope
B. Telescope
C. Spectrometer
D. Photometer
Answer» C. Spectrometer
Explanation: Dispersion occurs when different frequencies of light have different phase velocities, due either to material properties (material dispersion) or to the geometry of an optical waveguide (waveguide dispersion). A spectrometer (spectro-photometer, spectrograph or spectroscope) is an instrument used to measure properties alight over a specific portion of the electromagnetic spectrum, typically used in spectroscopic analysis to identify materials.
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