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6. Measuring Solids
6. Measuring Solids
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The surface of the object to be measured should have a
plane smooth surface.
Put one drop contact liquid on the measuring prism and
lightly press the smooth surface of the sample onto it.
There must be no air bubbles.
Open the reflecting mirror and direct light by way of the
mirror onto the prism.
Proceed in the same way as for measuring liquids.
The measurements occur now in reflected light, the
light/dark fields are exchanged and the contrast be-
comes less but this has no effect on the measurement
results.
Important!
When measuring solids the refractive index of the
►
contact fluid must be higher than that of the solid
to be measured.
When the refractive index of the solid to be measured is
higher than 1.65 nD then methyljod with 1.71 nD must
be used as a contact fluid.
The surfaces of the prisms must be cleaned immediately
after use with alcohol because contact liquids are very
corrosive.
The prisms are made of optical glass, therefore, one
must be careful not to scratch the surfaces.
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