This page describes the construction of a simple photometer to
be used with a microscope. The unit allows light intensity measurement of a
small crystal positioned at the center of the microscope field in reflectance
and transmission modes. Used in conjunction with a monochromator, the photometer
becomes a part of a microscope spectrometer.
Used in reflection modes with narrow band pass filters, the photometer can be
used to measure the reflection coefficient of opaque minerals and thus help