In a petrographic microscope, the light is first polarized, then the thin section is placed in that beam of light and then that light passes through a second polarizer. A weird thing happens to ...

In a petrographic microscope, the light is first polarized, then the thin section is placed in that beam of light and then that light passes through a second polarizer.

Petrographers do most of their work with microscopes that use reflected light (stereomicroscope), transmitted light (petrographic microscope) and electron beams (scanning electron microscope, SEM ...

Eyjafjallajökull ash under a petrographic microscope in crossed-polarized light at ~40x. Note the blocky nature of the ash and the variety of color. Image by Erik Klemetti.

Petrological microscope: This new lab is equipped with a Leica DM750P petrographic microscope with transmitted and reflected light capabilities. A 2.5 megapixel MC120 HD camera is attached to the ...

Petrography is the study of rocks in thin sections by means of a petrographic microscope, an instrument that uses polarized light vibrating in a single plane.

This isn't a normal microscope, but a petrographic microscope that utilizes the special optical properties of minerals cut thin, down to ~30 microns thick (we call them "thin sections").

It is a section of bone from a toothed whale from the Miocene epoch (about 15 million years old), sliced thin and placed under a petrographic microscope using cross-polarized light and a gypsum plate.