Cos ϕ. This light should journey farther compared to axial light to achieve a display screen, then it strikes the display screen at Yet another angle ϕ. The net outcome would be that the oblique illumination on the screen is lesser than the axial illumination with the component cos4 ϕ. https://messiahabazy.blogdomago.com/29181546/a-simple-key-for-glasses-store-near-me-unveiled