1, the principle of the projector is that the light shines on the convex mirror to gather the light, then the light passes through the slide, and then shines on the flat mirror through the convex mirror (the light passes through the optical center), and then the flat mirror reflects the image to the screen.

2, install KMPlayer player, find the setting function inside, there is a function that can reverse the picture. Just put it in the shoebox projection.

Extended data:

The basic principle of projector is to enlarge the shape and outline of the workpiece by using optical elements, and then project it onto the screen. It can be used to measure the profile of transmitted light and the surface shape of reflected light. In addition to watching movies, projectors are often used to measure complex contours and small workpieces.

As an imaging device, CRT is the earliest and most widely used display technology. This projector can decompose the input signal source into the fluorescent screens of three CRT tubes: R (red), G (green) and B (blue). The fluorescent powder is amplified and converged by the light emitting system under the action of high voltage, and a color image is displayed on the big screen.

The optical system and RT tube form a projection tube. Usually, a three-gun projector is a projector composed of three projection tubes. Because of the use of internal light source, it is also called active projection mode.