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This types of Filter in which the primary characteristic is an abrupt change between a region of rejection and a region of transmission are commonly known as edge filters. Edge filters are divided into two main groups, Long Wave Pass Filter reject the short wavelength and transmittance the longer wavelengths. |
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Short Wave Pass Filter reject longer
wavelength and transmittance the short wavelengths The operation may depend on many different mechanisms and the construction may take a number if different forms. These rely for their operation on absorption or interference or both. |
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