Question

is the measuring optical
instrument used to measure and
observe the optical

spectrum.
O Spectrometer
O demometer
O lactometer
O spherometer​

Answer 1

Answer:

Spectrometer is the answer for your question

Answer 2

Answer:

optical spectrometer

An optical spectrometer (spectrophotometer, spectrograph or spectroscope) is an instrument used to measure properties of light over a specific portion of the electromagnetic spectrum, typically used in spectroscopic analysis to identify materials.