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Figure 8: Principle of drop spectrometer. Collimated light passes through a narrow horizontal slit and is refocused onto a photodiode detector. The detected light depends on the size of shadow made by the drop passing through the beam.

Figure 8: Principle of drop spectrometer. Collimated light passes through a narrow horizontal slit and is refocused onto a photodiode detector. The detected light depends on the size of shadow made by the drop passing through the beam.