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11.A glass lens is coated on one side with a thin film of magnesium fluoride (MgF2) to
reduce reflection from the lens surface. (See Figure 1.) Determine the least coating
thickness that eliminates (via interference) the reflections at the middle of the visible
spectrum (>= 590 nm). Assume that the light is approximately perpendicular to the lens
surface.
A. 100.31 nm
B. 199.28 nm
C. 213.77 nm
D. 411.32 nm
Air
n=1.38
12
n
MgF₂
=1.38
Figure 1
Glass
№=1.38

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