Filters are designed to transmit and/or reflect different. Wavelengths of light. Different kinds of filters are long pass, short pass, band pass UV filters, IR filters etc.Filters are used for biomedical, Imaging and Measurement systems.Neutral Density Filters are used to reduce the brightness of an image without changing the color.
 
the categories of optical mirrors including
Ÿ  Color Glass Filters
Ÿ  Band Pass Filter
Ÿ  IPL Filter