1. The problem statement, all variables and given/known data Lenses often contain thin coatings to reduce reflections and UV radiation. Explain how this works. 2. Relevant equations 3. The attempt at a solution To reduce reflections on lenses, known as back-glare, they are often coated in what is called anti-reflective (AR). The AR causes the intensity of light reflected from the inner surface and the light reflected from the outer surface of the film to be nearly equal. The two reflections from each side of the film cancel each other out through destructive interference therefore decreasing the glare. In short, AR works by shifting the light waves out of phase resulting in destructive interference minimizing the glare. As the reflections are cancelled, energy still has to go somewhere and thus transmits into the lenses. In addition, most UV blockage is done by making the lens from a material that absorbs UV radiation. This question is very simple for a lot of my classmates but I ten too lose marks on these types of questions as english is not my second language. But yes, is my answer correct and is it clear to read?