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diff --git a/1694/CH2/EX2.45/EX2_45.sce b/1694/CH2/EX2.45/EX2_45.sce
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+clear;
+clc;
+printf("\nEx2.45\n");
+//page no.-90
+//given
+E=1.56;...............//energy of e ejected in eV
+lambda_o=2500*10^-8;..........//threshold wavelength in cm
+c=3*10^10;...........//speed of light in cm/sec
+e=1.6*10^-12;.........//charge in ergs
+h=6.62*10^-27;........//planck's constant in ergs-sec
+
+vo=c/lambda_o........//threshold frequency in m/s
+
+Eo=h*vo/e................//energy in eV
+
+TE=Eo+E..............//total energy
+//we know ,E=h*c/lambda
+
+lambda=((h*c)/(TE*e))..........//wavelength in cm
+
+printf("\nwavelength of incident light is 1.9*10^-5 cm\n");