Answer: A petrographic microscope sends transmitted polarized light through a thin section of rock.
Explanation: This kind of microscope is used to identify rocks and minerals in thin sections , is also called polarized light microscope and it is equipped with a rotating circular stage, a polarizer to generate polarized light and a second polarizer.
It is used for the study of textures and relations between the minerals and classification of rocks. The color changes that happen when rotating the support allow to identify the minerals present.
The petrographic studios are performed by the observation al microscope of a portion very fine of rock o mineral prepared on a glass.