Question

question 27
1 point
what does the revolving nosepiece hold in the microscope?
the ocular
the condenser
the diaphragm
the oil immersion objective
selected
clear selection
question 28
1 point
the two parts that regulate the amount of light that passes through the ocular are the:
fine and coarse adjustment knobs.
ocular and objective lenses.
illuminator and revolving nosepiece.
condenser and diaphragm.
selected
clear selection

Explanation:

For Question 27: The revolving nosepiece of a microscope is the component that holds objective lenses, and the oil immersion objective is a type of objective lens. Oculars are eyepieces at the top, the condenser focuses light below the stage, and the diaphragm controls light, none of which are held by the nosepiece.
For Question 28: The condenser focuses light onto the specimen, and the diaphragm (iris diaphragm) controls the diameter of the light beam, together they regulate the amount of light passing through to the ocular. Adjustment knobs control focus, lenses magnify, and the illuminator is the light source while the nosepiece holds objectives, so these pairs do not regulate light amount.

Answer:

Question 27: The oil immersion objective
Question 28: Condenser and diaphragm.