What r d differences between spectrometer and spectrograph?

Answer 1

spectrometer is a device that gives the spectrum of all intensities of a one wavelength at one time. it consists of the entrance & exit slits, dispersing element (like grating) &mirror. it detects the light and measure the intensities with a photomultiplier tube or other detectors and data acquisition system.

spectrograph also gives the spectrum of all intensities of a wavelength at one time.it consists of the entrance & exit slits, dispersing element (like grating) &mirror but it does not have any detector and does not record the spectrum.

Answer 2

A spectrometer measures the intensity of light as a function of its wavelength, providing a spectrum of the light. A spectrograph is an optical instrument that disperses light into its different wavelengths and records the resulting spectrum. In essence, a spectrometer is used to measure the spectrum while a spectrograph is the instrument that disperses and collects the spectrum.