Final answer:
The total magnification of a microscope with a 10X ocular lens and a 25X objective lens is 250X.
Step-by-step explanation:
The total magnification of a microscope is calculated by multiplying the magnification of the ocular lens by the magnification of the objective lens. In this case, the microscope has an ocular lens with a magnification of 10X and an objective lens with a magnification of 25X. To find the total magnification, you multiply these two numbers:
10X (ocular lens) × 25X (objective lens) = 250X total magnification.
Therefore, when you look through this microscope, objects will appear 250 times larger than their actual size.