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//Example number 7.10, Page number 7.17
clc;clear;close
// Variable declaration
lamda=0.58 // in m
theta=9.5*%pi/180 // in radian
n=1 // unitless
d=0.5 // d200=a/sqrt(2^2+0^2+0^2)=0.5a
// Calculations
a=n*lamda/(2*d*sin(theta)) // 2*d*sin(theta)=n*lamda
// Result
printf("a = %.2f Angstorms",a)
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