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//Example 2_6
clc();
clear;
//To Calculate the dispersive power of the grating
n=4000
e=1/n //units in cm
k=3
lamda=5000 //units in armstrongs
lamda=lamda*10^-8 //units in cm
theta=asin((k*lamda)/e)*(180/%pi) //units in degrees
costheta=cos(theta*%pi/180)
disppower=(k*n)/costheta
printf("The dispersive power of the grating is %.f",disppower)
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