Cos ϕ. This gentle must travel farther compared to axial mild to reach a display, and then it strikes the monitor at A different angle ϕ. The net outcome would be that the oblique illumination within the display screen is smaller than the axial illumination through the variable cos4 ϕ. https://gunnerpfmgu.blogerus.com/52307694/how-satellite-security-cameras-can-save-you-time-stress-and-money