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//Example 1_40
clc();
clear;
//To calculate the wavelength of source of light
betaa=0.30                //units in cm
d=0.04                   //units in cm
D=180                   //units in cm
lemda=((betaa*d)/D)*10^8
printf("The wavelength of source of light is %.0f angstroam",lemda)
//In text book answer is printed wrong as 6700A But the correct answer is  6667 A