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The Goniophotometer is a device that can measure the properties of light that is emitted by a light source. This gives insight in the uniformaty of the emitted light, the direction and the properties of light at certain angles and distances.
The refractometer is a device that makes it possible to measure the amount of affect a substance has on the direction of light. As light goes from one substrate into another, the light can bend slightly. This can be measured with the refractometer.