Hi all, I've been able to find the answers to most of my questions in these forums, but this time I was not able to. So here goes my first post: I've been learning about thin film interference, and it all makes sense to me except for the correlation between destructive interference caused by non-reflective coating on a lens and the amount of light getting through to the lens. Here's the general setup shown in my textbook: (also attached) From my understanding, the thickness of the film being 1/4 of the wavelength of some color of light causes the reflected light waves to interfere destructively. When the thickness of the film is 1/2 of the wavelength it results in constructive interference. In both cases, the light waves interact with the film and glass the same way aside from the phase changes they experience. In the book it says "[non-reflective coating] also increases the net amount of light that is transmitted through the lens, since the light that is not reflected will be transmitted." Doesn't the light only appear to be not reflected to us because it gets cancelled out by another light that is out of phase by 1/2 wavelength relative to it? However, the statement above implies that this thin film material simply transmits more light and reflects less light than the glass or lens. Please point out any mistakes in my logic or in the post (newbie here). Thank you in advance.