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//Example 2_1
clc();
clear;
//To calculate the number of lines in one centimeter of granting surface
lemda=5*10^-5 //units in centimeters
theta=30 //units in degrees
k=2
e=(k*lemda)/sin(theta*%pi/180)
n=e^-1
printf("no of lines per centimeter is %.0f",n)
//in text book the answer is printed wrong as 1000 correct answer is 5000
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