Microbiology LAB Exam #1 with correct answers 100% 2026

Microbiology LAB Exam #1 with correct answers 100% 2026 Microscope- The Condenser - Correct Answer focuses the light ging into the objective lens Microscope- The Iris Diaphragm - Correct Answer adjusts the amount of light going into the objective lens Microscope- Nosepiece - Correct Answer holds the objective lenses and rotates to change from one objective to another Microscope- Coarse Objective Knob - Correct Answer moves the stage larger distances to help get the object in focus Microscope- Fine Adjustment Knob - Correct Answer moves the stage smaler increments to help get the object in better focus Microscope- Objective Lens - Correct Answer magnifies the object. It is located near the object. Microscope- Occular Lens - Correct Answer magnifies the image of the object from the objective lens. It is located near the eye. Steps in using the microscope - Correct Answer 1) scanner power in place 2) place slide of specimen stage in place with stage clips 3) Using the course adjustment knob, raise the stage all the way up and then down slowly until you can see image of specimen 4) Readjust with fine adjustment knob Describe the purpose of the oil immersion lens - Correct Answer Used when oil is added to the slide. Oil must touch the object and objective lens to that the light does not refract futher Parfocal - Correct Answer Parfocal microscopes are able to move from one objective to the next and still be in focus due to the length of the objective lenses Resolution - Correct Answer The ability to distinguish between two objects that are very close together. What is resolving power? - Correct Answer The measurement of resolution What are two ways to increase resolving power? - Correct Answer 1. By decreasing the wavelength of light (using a blue filter) 2. Increasing the numerical aperature What units are used to express resolving power? - Correct Answer nm or nanometers What is better, smaller or larger resolving power? - Correct Answer Smaller is better Light microscopes have a 200nm resolving power Electron microscopes have a .2nm resolving power