How do you open iris on microscope?

To open the iris diaphragm on a microscope, locate the diaphragm adjustment lever or knob, typically located beneath the stage or on the condenser. By moving the lever or turning the knob, you can adjust the size of the opening, allowing more or less light to pass through to the specimen. This adjustment helps enhance the contrast and detail of the image you are viewing. Always make adjustments gradually to find the optimal lighting for your specific observation.