Find Optimal Wavelength for Thin Film Camera Lens Coated with Magnesium Fluoride

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To find the optimal wavelength for a camera lens coated with magnesium fluoride, the discussion focuses on the refractive indices of the lens (n = 1.90) and the coating (n = 1.40), along with the film thickness of 90.0 nm. Participants suggest exploring thin film interference equations to determine the wavelength that maximizes transmission through the film. The need for a specific equation that incorporates both refractive indices is emphasized. Overall, the conversation highlights the importance of understanding thin film interference principles in optics. The goal is to identify the wavelength in the visible spectrum that achieves the strongest transmission.
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Homework Statement



A camera lens (n = 1.90) is coated with a thin film of magnesium fluoride (n = 1.40) of thickness 90.0 nm. What wavelength in the visible spectrum is most strongly transmitted through the film?


Homework Equations



?

The Attempt at a Solution



I have no idea where to start, is there an equation that will use both n's at once?
 
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