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+//Chapter 4 : Laser and Holography
+
+clear;
+
+//Variable declaration
+delE=3*1.6*10**-19      //Energy of laser
+h=6.63*10**-34          //planck's constant
+c=3*10**8               //speed of light
+
+//Calculations
+lamda=(h*c)/delE/10**-9
+
+//Result
+mprintf("Wavelength of radiation= %d nm",lamda)