Answered

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The nonreflective coating on a camera lens with an index of refraction of 1.23 is designed to minimize the reflection of 631-nm light. If the lens glass has an index of refraction of 1.52, what is the minimum thickness of the coating that will accomplish this task

Sagot :

Answer:

the minimum thickness of the coating  is 128.25 nm

Explanation:

The computation of the minimum thickness of the coating  is shown below:

In the case of non-reflective coatings, for determining the minimum film thickness needed we need to apply the following formula  

Thickness = t = Wavelength ÷ 4n

where

n represent index of refraction of the coating material.

t = 631 ÷ (4 × 1.23)

= 128.25 nm

Hence, the minimum thickness of the coating  is 128.25 nm

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