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+//Example 6_2
+clc();
+clear;
+//To find how many photons emitted and power density
+v=3*10^8
+lamda=632.8*10^-9
+fre=v/lamda
+outpow=2.3*10^-3
+n=1
+h=6.626*10^-34
+N=(outpow*n)/(h*fre)
+printf("Number of photons emitted is")
+disp(N)
+printf("photons/second\n")
+spotarea=1*10^-6
+density=outpow/spotarea
+printf("Power density is %d kW/met^2",density)