. What part in the compound light microscope controls the amount of light that strikes the object? (0.5 Points) – Condenser – Illumination control dial – Iris diaphragm – Objective lenses
The Correct Answer and Explanation is:
The correct answer is Iris diaphragm.
Explanation:
In a compound light microscope, the iris diaphragm is the part that controls the amount of light that strikes the object being observed. It is located beneath the stage and above the light source. The iris diaphragm works by adjusting the size of the aperture (opening), allowing more or less light to pass through to the specimen. By controlling the amount of light, it helps improve contrast and resolution when viewing the specimen under the microscope.
- Condenser: While the condenser focuses light on the specimen, it does not control the amount of light. Instead, it directs and concentrates the light onto the specimen.
- Illumination control dial: This controls the brightness of the light coming from the light source but does not adjust the light intensity in the same way as the iris diaphragm. The illumination control affects the power of the light source rather than regulating the amount reaching the specimen.
- Objective lenses: The objective lenses magnify the image of the specimen. They are essential for resolving details, but they do not control the amount of light that strikes the object.
The iris diaphragm is crucial for regulating light intensity, which is important for enhancing image quality, particularly when using higher magnifications. By adjusting the light, the user can improve contrast and clarity, making it easier to observe fine details of the specimen.
