A compound absorbs light in the wavelength region $490-500 \mathrm{~nm}$. Its complementary colour is
A compound absorbs light in the wavelength region $490-500 \mathrm{~nm}$. Its complementary colour is
red
blue
orange
blue-green
Solution
When a compound absorbs a certain wavelength (i.e., $490 \mathrm{~nm}-500 \mathrm{~nm}$ ) 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.