"CAMERA LENSES"

Physics was applied in Cameras specifically in Camera Lenses. A photographic lens (camera lens) is an system of optical lens elements that are either fixed to the body of a camera or interchangeable. The lens sees an image, focuses it, and then transmits its colors, sharpness, and brightness through the camera to the photograph film, which like our memory records the image for processing and future use. The photographic lens is made of optical glass or in some cases plastic.

And we know that Optics or the study of light is under Physics. That's how Physics is related to Cameras.