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If fb and fg are the focal lengths of a convex lens for blue and red lights respectively and fb and fr are the respective value for a concave lens, then

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Light or visible light is electromagnetic radiation that can be perceived by the human eye. Visible light is usually defined as having wavelengths in the range of 400–700 nanometres, corresponding to frequencies of 750–420 terahertz, between the infrared and the ultraviolet.


If fb and fg are the focal lengths of a convex lens for blue and red lights respectively and fb and fr are the respective value for a concave lens, then






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