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//Chapter-1,Example1_7_2,pg 1-42
wavelength=6000 //wavelength of light in air
u=1.2 //refractive index of transparant material
wavelength_1=wavelength/u //The wavelength of wavelength_1 in a medium of refractive index 'u'
t=wavelength_1/4 //thickness of coating
printf("\nThe thickness of coating to eliminate reflection is t = %.f A.\n",t)
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