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+//chapter 9 example 4a//
+clc
+clear
+//angular velocity=A,llength at which rotating mirror from the photo detector=L,shadow pulse of width=We,shadow velocity=V,outer diametetr=do//
+L=0.1;//in mts//
+A=4;//in rad sec-1//
+V=L*A;//in mts/sec//
+printf("\n shadow velocity=%f m/sec\n",V)
+We=250;//in micro seconds//
+do=We*V;//outer diameter of the fibre//
+printf("\n outer diamter of the fibre=%f micro meter\n",do)
+\ No newline at end of file