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+//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