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diff --git a/1694/CH2/EX2.3/EX2_3.sce b/1694/CH2/EX2.3/EX2_3.sce
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+clear;
+clc;
+printf("\nEx2.3\n");
+//page no.-55
+//given
+h=6.65*10^-27;...............//planck constant in ergs-sec
+m=9*10^-28;..................//mass of e
+e=4.8*10^-10;...............//charge in e.s.u.
+V=1250;.....................//potential difference in V
+//By debroglie relationship, lambda=h/m*v
+
+lambda=h*sqrt(150/(m*e*V)).............//resolving power in cm
+
+printf("\nresolving power of microscope is 0.351 angstrom\n");