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What type of market structure is characterized by having a few dominant firms and substantial, but not complete, barriers to entry?
High-power
Refers to an objective lens on a microscope with a high magnification capability, used for examining small or detailed samples.
Iris Diaphragm
It is an adjustable aperture in optical devices, like microscopes and cameras, controlling the amount of light passing through the lens.
Revolving Nosepiece
A rotating part of a microscope that holds the objectives, allowing for quick changing of magnification by rotating the objectives into position.
Substage Light
A light source located beneath the stage of a microscope that illuminates the specimen from below, enhancing its visibility.
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