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+//ques-22.20
+//Calculating glancing angle required
+clc
+a=305;//edge length (in pm)
+w=150;//wavelength (in pm)
+d=a/sqrt(2);
+c=w/(2*d);
+//For sind(ang) = c
+ang=20.35;
+printf("The glancing angle is %.2f degrees.",ang);