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clear
//
//
//
//Variable declaration
lamda=7000*10^-10; //wavelength(m)
d=5*10^-3; //aperture(m)
f=0.2; //focal length(m)
P=50*10^-3; //power(W)
//Calculation
d_theta=1.22*lamda/d; //angular speed(radian)
A=(d_theta*f)^2; //areal speed(m^2)
I=P/A; //intensity of image(watt/m^2)
//Result
printf("\n areal speed is %0.3f *10^-8 m^2",A*10^8)
printf("\n intensity of image is %0.2f *10^5 watt/m^2",I/10^5)
printf("\n answer given in the book is wrong")
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