A microscope has two of many things! Here are a few possibilities, depending on what you're thinking of:

* Eyepieces: These are the lenses you look through to see the magnified image.

* Objective lenses: These are the lenses that are attached to the nosepiece and provide different levels of magnification.

* Focusing knobs: There's usually a coarse adjustment knob for large focusing movements and a fine adjustment knob for precise focusing.

* Light sources: Microscopes often have two light sources, one for illuminating the sample from below (transmitted light) and one for illuminating the sample from the side (reflected light).

Could you tell me a bit more about what you're looking for? That might help me give you a more specific answer!