Question

which letter points to the illuminator?

Explanation:

Identify labeled parts of the stereomicroscope

• A points to the eyepiece (ocular lens).
• B points to the stage plate (which contains the in-base light source/illuminator).
• C points to the base.
• D points to the focus knob.
• E points to the microscope arm/pillar.

Determine the location of the illuminator

• The question asks for the illuminator (light source).
• On this dissecting/stereomicroscope, the transmitted light source (illuminator) is built directly into the stage plate area at the base to shine light up through a translucent specimen.
• Therefore, letter B points to the illuminator/stage plate light source.

Answer:

B