Cos ϕ. This light has got to travel farther compared to the axial light to reach a display, after which you can it strikes the screen at another angle ϕ. The online final result is that the oblique illumination to the screen is smaller compared to the axial illumination because https://best-bluetooth-speaker58898.blogs100.com/30339059/5-tips-about-cheap-glasses-near-me-you-can-use-today