To determine the total magnification of a microscope, you simply multiply the magnification power of the objective lens by the magnification power of the eyepiece (ocular lens). For instance, if you are using a 10x eyepiece and a 40x objective lens, the total magnification would be calculated as follows:
Total Magnification = Eyepiece Magnification x Objective Magnification
In this case:
Total Magnification = 10x (eyepiece) x 40x (objective) = 400x
This means that the specimen being viewed will appear 400 times larger than its actual size. Knowing the total magnification is essential for understanding the level of detail you can observe through the microscope.