magnifying power

Magnification in optics refers to the size of an image relative to the size of the object that created it. It's a key concept for visual instruments, indicating how much larger an object appears when viewed through a device.12

There are different types of magnification:
* Linear magnification is the ratio of image length to object length, measured perpendicular to the optical axis. A negative value means the image is inverted.1
* Angular magnification is the ratio of the angle subtended by the image at the eye to the angle subtended by the object when viewed directly. This is particularly relevant for magnifiers and binoculars.31

While there's no theoretical limit to magnification, practical limits are set by an optical system's resolving power—its ability to distinguish fine details. In compound microscopes, the total magnifying power is the product of the objective lens's magnification and the eyepiece's magnification.14