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Physics	
 Learning	
 Object	
 9	
 
	
 
Yiying	
 Lin	
 15621148	
 
	
 
Thin	
 Film	
 Interference	
 
	
 
Question	
 
	
 
Plating	
 a	
 thin	
 layer	
 of	
 MgF2	
 (refractive	
 index	
 n=1.38)	
 on	
 a	
 piece	
 of	
 glass	
 (n=1.60)	
 
as	
  an	
  antireflection	
  film.	
  A	
  light	
  has	
  a	
  wavelength	
  5000Å	
  that	
  has	
  a	
  normal	
 
incidence	
 through	
 the	
 glass	
 from	
 the	
 air	
 (n=1.00).	
 If	
 the	
 reflex	
 is	
 minimized,	
 what	
 
is	
 the	
 least	
 thickness	
 of	
 MgF2	
 layer?	
 
	
 
A. 1250	
 Å	
 
B. 906	
 Å	
 
C. 2500	
 Å	
 
D. 871	
 Å	
 
	
 
	
 
	
 
Answer1	
  	
 
906	
 Å	
 
	
 
When	
 k=1,	
 it	
 is	
 the	
 thinnest.

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  • 1. Physics Learning Object 9 Yiying Lin 15621148 Thin Film Interference Question Plating a thin layer of MgF2 (refractive index n=1.38) on a piece of glass (n=1.60) as an antireflection film. A light has a wavelength 5000Å that has a normal incidence through the glass from the air (n=1.00). If the reflex is minimized, what is the least thickness of MgF2 layer? A. 1250 Å B. 906 Å C. 2500 Å D. 871 Å Answer1 906 Å When k=1, it is the thinnest.