Why is white light considered to be poll-chromatic in nature?

Question

(i) Why is white light considered to be poll-chromatic in nature?

(ii) Give the range of the wavelength of those electromagnetic waves which are visible to us

Answer 1

(i) White light is made up of seven colours i.e ., VIBGYOR that is why it is considered to be polychromatic. 

(ii) Range of wavelength which are visible to us are 4000 Å to 8000 Å.