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3. In order to reduce light reflection on a lens surface (nr
(1 = 1/4), which of following coating material should be used?
1.5) by coating a thin film with thickness
A. Zinc sulfide (n
B. Cerium fluoride (n = 1.63).
C. Magnesium fluoride (n = 1.35).
D. Zirconium dioxide (n = 2.10).
2.32).

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