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//Example 1_21
clc();
clear;
//To find the wavelength of light used
D5=0.3 //units in cm
D25=0.8 //units in cm
R=100 //units in cm
P=20
lemda=(D25^2-D5^2)/(4*P*R)
printf("The wavelength of the light used is %f cm",lemda)
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