Reflective coatings on eyeglasses (or camera lenses) are meant to reduce glare. These coatings are thin films that have a different refractive index from the glass lens. The diagram at right shows an enlarged version of this thin film and an incident ray of light hitting the film. An observer, who can see the reflected rays, is also shown. a) [2 points] Use the concept of interference to clearly explain why this thin film can reduce glare (reflected light) for the observer. As part of your explanation, draw two rays to the diagram that show how light is reflected off the film, and write expressions for the path length difference based on both the geometry ( ) and the kind of interference (