To determine the total magnification of a light microscope, you simply multiply the magnification of the objective lens by the magnification of the eyepiece lens.

Here's how it works:

* Objective Lens: This is the lens closest to the specimen. Common objective lens magnifications are 4x, 10x, 40x, and 100x.

* Eyepiece Lens: This is the lens you look through. Most eyepieces have a magnification of 10x.

Example:

* If you are using a 40x objective lens and a 10x eyepiece, the total magnification is 40 x 10 = 400x.

Here is a table that summarizes this concept:

| Objective Lens Magnification | Eyepiece Lens Magnification | Total Magnification |

|---|---|---|

| 4x | 10x | 40x |

| 10x | 10x | 100x |

| 40x | 10x | 400x |

| 100x | 10x | 1000x |

Remember:

* The total magnification is a measure of how much larger the image appears compared to the actual object.

* Higher magnification generally provides more detail, but it can also make the image less clear.

* Some microscopes allow you to adjust the magnification of the eyepiece. Be sure to check your microscope's instructions to see how to do this.