When using a microscope with a 10x ocular and the 40x objective in place, the total magnification is?

When using a microscope with a 10x ocular and a 40x objective, the total magnification is calculated by multiplying the magnification of the ocular with the magnification of the objective. In this case, 10x ocular x 40x objective = 400x total magnification.

  Option A, 100x, is incorrect because it only accounts for the magnification of the objective and does not include the ocular.
  Option C, 1000x, is incorrect because it multiplies the magnifications of both the ocular and the objective, resulting in an inaccurate total magnification.
  Option D, 40x, is incorrect because it only accounts for the magnification of the objective and does not include the ocular.