The absorption type optical filter usually consists of coloured glasses, gelatin etc. and solutions of the coloured substances.

The absorption type optical filter usually consists of coloured glasses, gelatin etc. and solutions of the coloured substances. Correct Answer True

The absorption type optical filter usually consists of colour media: colour glasses, coloured films (gelatin, etc.), and solutions of the coloured substances. This type of filter has a wide spectral bandwidth, which may be 40 to 50 m in width at one-half the maximum transmittance.
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