Auniform film of a material that has index of refraction 1.30 covers the front surface of a pane made of glass with index of refraction 1.55. when a beam of monochromatic light initially traveling in air strikes the film at normal incidence, the minimum film thickness for which the light reflected from the air-film interface and the light reflected from the film-glass interface cancel is 115 nm .
part a
what is the energy of each photon in the light beam?