Final answer:
The magnification of the ocular lens is 10X, calculated by dividing the total magnification (1500X) by the objective lens magnification (150X).
Step-by-step explanation:
To determine the magnification of the ocular lens, we need to use the formula for total magnification of a compound microscope. Total magnification is the product of the magnifications of the objective lens and the ocular lens. In this case, the total magnification is given as 1500X, and the magnification of the objective lens is 150X. So the calculation to find the magnification of the ocular lens (O) is as follows:
O = Total magnification / Objective lens magnification
O = 1500X / 150X
O = 10X
Therefore, the magnification of the ocular lens is 10X, which corresponds to option (a).