Urinalysis and Body Fluids 6th Edition by Majorie DiLorenzo, Susan Strasinger

Exercise 21

Which of the following should be used to reduce light intensity in bright-field microscopy?

A. Centering screws

B. Aperture diaphragm

C. Rheostat

D. Condenser aperture diaphragm

Step 1 of 2

Bright-field microscopy:

• In this microscopy light background is used and the objects appear dark.

• Bright-field microscopy is mostly used by clinical laboratory.

• High intensity light should not be used as sediment is examined under decreased light.

• This adjustment of light is done by rheostat present in light source.

Rheostat:

• It is a knob on lamp which brightens or dims the light source.

Therefore, “rheostat” is used to reduce the light intensity in bright-field microscopy. Hence, the correct answer is option.