//Ex1_6
//given 
//page no 12
clc;
clear;
disp('Solution (i) is ');
l=720;      //wavelength in nm
n=1.5;          //refractive index
lm=l/n;
disp('nm',lm,'Wavelenth is');       //result
disp('Solution (ii) is ');
c=3*10^8;           //in m/s speed of light
u=c/n;
disp('m/s',u,'Velocity  is');       //result