What if the eyepiece lens magnification is 10X and the objective lens magnification is 40X. What is the total lens magnification?

To calculate the total magnification, you simply multiply the magnification of the eyepiece lens by the magnification of the objective lens.

Total magnification = Eyepiece lens magnification x Objective lens magnification
Total magnification = 10X x 40X
Total magnification = 400X

Therefore, the total lens magnification is 400X.

Total lens magnification = Eyepiece lens magnification x Objective lens magnification
= 10X x 40X
= 400X