Which part of the microscope is used to focus light on the specimen?

The condenser is the part of the microscope responsible for focusing light on the specimen. It is located below the stage and works to concentrate light from the light source onto the specimen, enhancing the clarity and brightness of the image being viewed. By altering the position of the condenser, a user can adjust the focus of the light, which is crucial for optimal illumination and resolving details in the specimen.

The eyepiece serves primarily to magnify the image produced by the objective lens and is used for viewing. The objective lens magnifies the specimen, but it does not focus the light; instead, it captures the light that has already been directed towards the specimen. The diaphragm, on the other hand, controls the amount of light that reaches the specimen, but it does not focus that light. Understanding the specific function of each component is essential for using the microscope effectively and gaining clear observations of biological specimens.