Which of the following is NOT a component of a spectrophotometer?

A spectrophotometer is an analytical instrument used to measure the intensity of light at different wavelengths. The key components of a spectrophotometer include a radiation source, which provides the light needed for the measurement; a sample holder, where the sample to be analyzed is placed; and a detector that converts the light that passes through the sample into an electrical signal for measurement.

While there are various types of devices and technologies that serve as analyzers in different instruments, a crystal analyzer is not a standard component of a spectrophotometer. Typically, spectrophotometers utilize diffraction gratings or prisms to separate light into its component wavelengths, rather than a crystal analyzer. This distinguishes the correct answer, as it identifies a component that is not commonly found in the structure of a spectrophotometer.