Final answer:
The total magnification provided by a microscope with a 40X high power objective lens and a 10X ocular lens is 400X total magnification, corresponding to option 1) 400X.
Step-by-step explanation:
The question relates to the calculation of total magnification when using a compound microscope. The total magnification of a microscope is found by multiplying the magnification of the objective lens by the magnification of the ocular lens. In this particular instance, with a high power objective lens magnified by 40X and an ocular lens magnification of 10X, the total magnification would be:
40X (magnification of the objective lens) × 10X (magnification of the ocular lens) = 400X total magnification.
Therefore, when the high power objective lens is magnified by 40X, the total magnification is 400X, which corresponds to option 1) 400X.