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Why are stains used when observing biological tissues under a microscope?
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5. Cell Components
Microscopes
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Which knob should you use to get the image in focus when using the higher-power objective lenses on a microscope?
A
Fine focus knob
B
Coarse focus knob
C
Diaphragm control knob
D
Stage adjustment knob
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Understand the function of each knob on the microscope: The coarse focus knob is used for large movements to initially bring the specimen into focus, typically with low-power objective lenses.
Recognize the role of the fine focus knob: This knob is used for small, precise adjustments to sharpen the image, especially when using higher-power objective lenses.
Consider the diaphragm control knob: This knob adjusts the amount of light that reaches the specimen, but does not directly affect focus.
Evaluate the stage adjustment knob: This knob moves the stage horizontally or vertically to position the specimen, but does not focus the image.
Conclude that for higher-power objective lenses, the fine focus knob is the appropriate choice to achieve a clear and focused image.
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