Filter

Abstract

This invention relates to a filter that sequentially comprises a first dielectric multilayer film, a resin film, a phosphate glass, and a second dielectric multilayer film. The resin film contains resin and a pigment having specified spectral dispersive properties. The second dielectric multilayer film contains an H2 layer with a refractive index and a QWOT within a specific range. When the H2 layer closest to the phosphate glass is designated as the first H2 layer, a first M2 layer with a QWOT satisfying a specific range is included between the first H2 layer and the phosphate glass. The filter satisfies all of the specified spectral dispersive properties (i-1) to (i-4).

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