Identify all parts of the microscope listed in Lab Exercise 2 (Lab Manual) and know their function.
Objective Lenses: A few of the microscopes may have 4 objective lenses, with the largest labeled 100. Do not use this lens! It is an oil-immersion lens and requires a drop of oil between the lens and the slide.
Light Dimmer Switch: In addition to the main on/off switch to turn on the light, you can also adjust the intensity of the light using the light dimmer dial on the left side of the base (if the stage is facing you). If you turn on the scope and you don't see any light (and it is plugged in!), try turning this dial to increase the light intensity. It is usually best to turn down the brightness somewhat while using scanning or low power objective lenses, but you may need to increase light intensity under high power magnification due to the decrease in working distance and much smaller field of view.
Condenser: The condenser is situated directly beneath the stage, and concentrates the light onto the specimen. It can be adjusted (raised and lowered) with the control knob on the left side of the stage. Adjusting the condenser allows you to improve the sharpness of the image. If you have a bright spot (part of the field of view is brighter than the rest), try lowering the condenser a bit.
You will be expected to demonstrate your ability to correctly use the microscope during Lab Exam 1.