Imaging principle of camera, projector and slide projector

1, the principle of the camera is that when the distance from the object to the convex lens is more than twice the focal length, it becomes an inverted and reduced real image, and the image is different from the object.

2. The principle of projector (slide projector) is that when the distance from the object to the convex lens is between 2 times the focal length and 1 times the focal length, it becomes an inverted magnified real image, and the image is different from the object.

3. The principle of magnifying glass is that when the distance from the object to the convex lens is less than 1 times the focal length, it becomes a vertical magnified virtual image, and the image and the object are on the same side.

projector

A projector is an optical instrument, which uses optical elements to enlarge the outline of a workpiece and project it onto a screen. The profile can be measured by transmitted light, and the surface shape of blind holes and the surface of parts can also be measured by reflected light.