What ocular lens magnification is commonly paired with a 40x objective lens in a compound light microscope?

In a compound light microscope, the total magnification is calculated by multiplying the magnification of the ocular lens by the magnification of the objective lens. When using a 40x objective lens, a common ocular lens magnification that is typically paired with it is 10x. This results in a total magnification of 400x (40x objective multiplied by 10x ocular).

The 10x ocular lens is standard for most biological compound microscopes, providing a good balance of magnification and field of view for examining specimens. This combination is widely used in laboratories and educational settings, as it allows for detailed observation without overly compromising the ability to see the entire specimen.

Other ocular lens magnifications may exist, but they either provide lower total magnification or are not commonly used in conjunction with a 40x objective, making the 10x ocular lens the most practical and popular choice.