Nonreflecting coating on a lens

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A transparent film with a refractive index of 1.6 is applied to a glass lens with a refractive index of 1.76 to create a nonreflective coating aimed at minimizing light reflection at a wavelength of 500 nm. The discussion highlights the confusion surrounding the calculation of the minimum thickness required for effective anti-reflection properties. Participants emphasize the importance of understanding how anti-reflection coatings function, particularly in reducing internal reflections within optical systems. Suggestions include researching anti-reflective coatings to gain better insight into their design and application. The conversation underscores the need for clarity on the principles governing optical coatings to solve related problems effectively.
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Homework Statement



A transparent film (n = 1.6) is deposited on a glass lens (n = 1.76) to form a nonreflective coating. What is the minimum thickness that would minimize reflection of light with wavelength 500 nm in air?

Homework Equations



wavelengthXfrequency=c/n (Not sure if that's relevant)

The Attempt at a Solution



Not sure how to start. I'm having trouble with this problem. Can someone please help
 
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titan81 said:

Homework Statement



A transparent film (n = 1.6) is deposited on a glass lens (n = 1.76) to form a nonreflective coating. What is the minimum thickness that would minimize reflection of light with wavelength 500 nm in air?

Homework Equations



wavelengthXfrequency=c/n (Not sure if that's relevant)

The Attempt at a Solution



Not sure how to start. I'm having trouble with this problem. Can someone please help

Welcome to the PF.

How do anti-reflection coatings on optics work?
 
I'm not sure. Thats my problem. I'm completely lost on this topic.
 
Have you Googled on anti-reflective coatings? Lens designers choose coatings and apply them such that internal reflections between individual elements of a lens are minimized, at least for the wavelengths that the sensor (human eye, chip, etc) can sense.
 
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