# Glass lens with antireflection coating

###### Question:

A glass lens (nglass = 1.52) has anantireflection coating of MgF2 (n = 1.38).

(a) For 639 nm light, what minimumthickness of MgF2 will cause the reflected raysR2 and R4 in the figuretointerfere destructively, assuming normal incidence?
(b) Interference will also occur between the forward-moving rays,R1 and R3 in the figure.What minimum thickness ofMgF2 will cause these two raysto interfere constructively?

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