kelseatuttleni
06.04.2020 •
Physics
Anti-reflective coatings on lenses use thin-film interference to eliminate the reflection of a particular color. Suppose a glass lens (ng = 1.55) is covered with a thin film (nf = 1.35) to prevent green light (λ = 521 nm) from being reflected.
a. Write an expression for the minimum thickness the film can have, t.
b. Calculate the minimum thickness, t, in nanometers?
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Ответ:
Given:
ng = 1.55nf = 1.35λ = 521 nmAccording to the question,
The optical path difference will be:
→
The condition for destructive interference of reflected light will be:
→
For minimum thickness,
m = 1then,
→
hence,
The minimum thickness will be:
→
By putting the values, we get
Thus the responses above is right.
Learn more about reflection here:
link
Ответ:
Answer with Explanation:
We are given that
a.We have to find the expression for the minimum thickness the film can have ,t.
Condition for destructive interference
For minimum thickness m=0
Then,
b.Substitute the values
Ответ:
anthi8ng that takes up space
Explanation: