The typical magnification of an ocular lens is 10x. The ocular lens is the lens closest to the eye and is used to magnify the image produced by the objective lens. The magnification of the objective lens varies depending on the type, with common magnifications being 4x, 10x, 40x, and 100x. To calculate the total magnification of a microscope, you multiply the magnification of the objective lens by the magnification of the ocular lens. For example, if the objective lens has a magnification of 40x and the ocular lens has a magnification of 10x, the total magnification would be 400x.