Question

the ________ causes the stage to move upward or downward. multiple choice coarse adjustment knob mechanical stage iris diaphragm objective lens

Explanation:

In microscopy, the coarse adjustment knob is used to move the stage up or down for initial focusing. The mechanical stage is for moving the specimen horizontally. The iris diaphragm controls light intensity and the objective lens is for magnification.

Answer:

coarse adjustment knob