# A dye imparts red colour on fabric . What colour of light was absorbed by the dye ?

$(a)\;Blue\qquad(b)\;Red\qquad(c)\;Green\qquad(d)\;Orange$

Explanation :
Green is complementary for colour of red .
When organic molecules are exposed to radiations in the visible region, they may absorb a certain portion of visible light. If a certain portion of the light is absorbed and the rest is reflected, the substance has the colour of the reflected light. All dyes absorb a certain portion of visible light since they are organic compounds. The colour of light reflected which is complementary to the colour absorbed, imparts colour to the dye.
edited Mar 26