Download the optical (light) microscope

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Light filters
They are used to modify the light for ease of observation, for
improved photomicroscopy, or to alter contrast.
 A green or yellow-green filter is widely used in black-and-white
photography to reduce the effect of lens defects on image quality.
Most objectives, particularly the lower cost achromats, require
such filtering for best results.
 Polarizing filters are used to produce plane-polarized light (one
filter) or crossed-polarized light (two filters rotated to produce
extinction) for examination of noncubic (crystallographic)
materials. Materials that are optically anisotropic, such as
beryllium, zirconium, α-titanium, and uranium, can be examined
in the crossed-polarized condition without etching. A sensitivetint plate may also be used with crossed-polarized light to
enhance coloration.