Keyhole imaging law For example, whether it is a virtual image or a real image, whether it is enlarged or reduced, and the relationship between object distance, image distance and image

As shown in the principle of image formation, the light emitted from point a and B on object AB respectively passes through hole O and shoots to the light screen on the right side, forming an image a & # 39; B & # 39;, triangle ABO is similar to triangle a & # 39; B & # 39; O, so a & # 39; B & # 39; o