Optical Filters

Dichroic Filter/Mirror at 45 deg

Reflected light

Transmitted Light

Light Source

• Interference filters: Dichroic, Dielectric, reflective filters…….reflect the unwanted wavelengths

• Absorptive filters: Colour glass filters…..absorb the unwanted wavelengths

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Optical Filters

This slide introduces two types of filters, which are interference and absorptive filters. A schematic of a dichroic filter is illustrated below.