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diff --git a/2780/CH4/EX4.13/Ex4_13.sce b/2780/CH4/EX4.13/Ex4_13.sce
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index 000000000..d46cb8420
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+++ b/2780/CH4/EX4.13/Ex4_13.sce
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+clc
+//to calculate length 
+l=40 //length in cm
+c=5/100 //concentration in percentage
+theta1=35 //optical rotation in degree ,where theta1=theta'
+c1=10/100 //concentration in % ,where c1=c'
+theta=20
+//formula of specific rotation is alpha=10*theta/l*c
+l1=l*c*theta1/(c1*theta)
+disp("length is l1="+string(l1)+"cm")