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Problem 4
Lenses are often coated with thin films of transparent
substances such as MgF2 (n=1.38) to reduce the reflection
from the glass surface. How thick a coating is needed to
produce a minimum reflection_at the center of the visible
spectrum (A=550 nm)?
Air
Glass
MGF2
n2 = 1.38 ng 1.50
n1 = 1.00
Given: A-550 nm
12
n=1.38
Minimum reflection:
a
(Destructive interference)
Thickness of coating: d=?

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