4.2 Supply and Demand Analysis: An Oil Import Fee
Refer to the information provided in Figure 4.4 below to answer the questions that follow. 
Figure 4.4
-Refer to Figure 4.4. If a $25 per barrel tax is levied on imported oil, the United States will
Definitions:
Focus Knobs
Controls on a microscope that adjust the clarity and sharpness of the specimen being viewed by moving the lenses closer or farther from the specimen.
Iris Diaphragm
A mechanical device, typically part of a camera or microscope, that controls the amount of light passing through a lens or onto a specimen.
Field Diameter
The diameter of the field of view seen through the microscope, typically measured in millimeters or micrometers.
Magnification
The process of enlarging the appearance of an object as viewed through an optical instrument like a microscope or telescope.
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