Question

match the part to the function. light source, eye - piece, focus knob, objective lens. what you look through to see the object, the part that lights up the object, the part you turn to focus on the object, the part that magnifies the object

Explanation:

The objective lens magnifies the object. The focus knob is turned to focus on the object. The light source lights up the object. The eyepiece is what you look through to see the object.

Answer:

Objective lens - The part that magnifies the object
Focus knob - The part you turn to focus on the object
Light source - The part that lights up the object
Eyepiece - What you look through to see the object