What does the condenser do?

• A. Adjusts the objective magnification
• B. Regulates the focus
• C. Filters light intensity
• D. Focuses the light source onto the slide providing good resolution

Answer: (D)

The condenser’s job is to collect and concentrate light and direct it through the specimen. Placed under the stage, it uses lenses to form a bright, even cone of light that fills the field of view. This focused illumination makes the sample look brighter and helps resolve fine details, especially when paired with the iris diaphragm to optimize contrast. The other described actions belong to different parts: changing objective magnification, adjusting the focus with the focusing knobs, or filtering/light control mainly via the light source and diaphragm—not the condenser itself. So, the condenser focuses the light onto the slide to provide good resolution.