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  4. A compound absorbs light in the wavelength region 490-500 nm . Its complementary colour is

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Q. A compound absorbs light in the wavelength region 490−500nm . Its complementary colour is

EAMCETEAMCET 2013

Solution:

When a compound absorbs a certain wavelength (i.e., 490nm−500nm ) from the visible light which corresponds to the blue-green light in the visible spectrum, the colour or light transmitted by it does not contain the colour of absorbed radiation and thus shows the complementary colour, i.e., red.