Brightness can be changed by changing the voltage to the lamp and adjusting the condenser and diaphragm/pinhole apertures.
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The condenser in a microscope helps adjust the brightness of an image by controlling the amount of light that reaches the specimen. By adjusting the condenser aperture and height, the user can control the illumination and hence the brightness of the image.
The iris adjustment on a microscope controls the amount of light passing through the specimen. By adjusting the iris, you can increase or decrease the brightness of the image, which can help improve clarity and contrast when viewing the specimen.
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An image can appear blurred under a microscope due to improper focusing, contamination on the microscope lens or slide, incorrect magnification setting, or presence of air bubbles in the viewing field. Proper cleaning and adjustment of the microscope components can help improve image clarity.
The microscope focusing knob is used to adjust the distance between the objective lens and the sample, allowing you to bring the sample into focus for a clear image. Turning the knob moves the stage up or down, changing the focal point of the lens to achieve sharp focus.
To ensure optimal viewing of cells through a microscope, you can adjust the focus by fine-tuning the microscope's focus knobs until the cells appear clear and sharp. Additionally, adjusting the light intensity can help improve the contrast and visibility of cellular structures.