Question

Does light have a magnetic field around it? Or does it have an electric field around it? How can we measure the strength of either of the two? Or what is the strength of the field ,? Or it does not posses any?

Answer 1

Light is electromagnetic waves. It comprises of oscillating electric and magnetic fields in the plane perpendicular to the direction of propagation of light. These oscillations in turn produce oscillating magnetic and electric fields and these fields are getting established further and further and we say that light is advancing further.When light wave is incident on an electron bound with the atom , the electron starts oscillations under the effect of oscillating electric field of light wave.
Light measurement is done with two different set of units. These set of units are: Radiometry Unit; Photometry Unit.