Assuming a constant (non-adjustable) light source power, identify the part of the microscope you would adjust to limit the amount of light entering the microscope.

Select all that apply.

Question

Assuming a constant (non-adjustable) light source power, identify the part of the microscope you would adjust to limit the amount of light entering the microscope.

Select all that apply.

BlackTom AI · Accepted Answer

We start by identifying which microscope components control the amount of light entering the specimen when the light source power is fixed.
Option: Iris diaphragm
- The iris diaphragm is designed to regulate the amount of light that passes through the specimen by opening or closing its aperture. With a constant light source, adjusting the iris directly changes the light entering the objective, thereby controlling illumination intensity at the sample. This makes it a correct choice.
Option: Condenser
- The condenser’s role is to focus and shape the light cone onto the specimen for even illumination. While it can influence the quality and uniformity of illumination, it does not fundamentally limit the total light entering the system when the source power is fixed. Therefore, it is not the primary control for limiting light entering the microscope.
Option: Objective
- The objective lens group magnifies the image but does not regulate how much light enters the microscope. Brightness is largely determined by the illumination system and diaphragms, not by the objective’s own control of light entry. This makes it an incorrect choice for limiting entering light.
Option: Eye piece
- The eyepiece (viewing lens) only magnifies the image for the observer and does not control the light entering the microscope from the specimen side. While it can influence perceived brightness, it does not limit the light entering the microscope at the source or through the condenser/diaphragm pathway. This is therefore incorrect.
In summary, the component that directly limits the amount of light entering the microscope with a constant light source is the Iris diaphragm. The Condenser, while important for illumination quality, does not strictly limit entering light in the same way. The Objective and Eyepiece do not regulate the light entering the system.

Assuming a constant (non-adjustable) light source power, identify the part of the microscope you would adjust to limit the amount of light entering the microscope. Select all that apply.

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