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+//OptoElectronics and Fibre Optics Communication, by C.K Sarkar and B.C Sarkar
+//Example 9.4
+//OS=Windows 10
+////Scilab version Scilab 6.0.0-beta-2(64 bit)
+clc;
+clear;
+
+//given
+alpham=26.1;//angular limit of far field pattern in degrees
+NA=sind(alpham);//numerical aperture 
+L=16.7;//length of picture in cm
+
+AB=(L/2)/[tand(alpham)];//distance from the screen in cm
+mprintf("The numerical appertur is=%.2f ",NA);
+mprintf("\nThe distance from the screen is=%.2f cm",AB);
+//th answer vary due to rounding