1say in a medium of refractive index μ a ray of light travels x disp. in t time
so, t=x/v
in air in same time interval t it travels =c*t
=μv*x/v
=μx
this is the optical path (μx)
.... i hpe itz clear nw?
4 Answers
1
1or simply the distance travelled in vacum is μD and wavelength is λd