//Chapter-2,Example2_2_5,pg 2-11

a=12*10^-7                                //width of slit

n=1                                       //for first minimum

wavelength=6000*10^-10                           //wavelength of light 

angle=asind(n*wavelength/a)                 //angular seperation 

printf('\nThe half angular width of the central  maximum is angle = %.1f degrees\n',angle)