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clear
//
//
//
//Variable declaration
dlamda=10^-4*10^-10; //width(m)
lamda=6000*10^-10; //wavelength(m)
c=3*10^8; //velocity of light(m/sec)
//Calculations
delta_t=lamda^2/(2*%pi*c*dlamda); //time required(second)
//Result
printf("\n time required is %0.1f *10^-8 second",delta_t*10^8)
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