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Date Submitted: 07/29/2015 08:17 AM
Lab 4: Introduction to the Microscope
Pre-Lab Questions
1. Label the following microscope using the components described within the Introduction.
Stage
Stage
Course Adjustment Knob
Course Adjustment Knob
Revolving Nosepiece
Revolving Nosepiece
Objective Lenses
Objective Lenses
Base
Base
Light
Light
Stage Clips
Stage Clips
Arm
Arm
Head
Head
Ocular Lens
Ocular Lens
Experiment 1: Virtual Magnification Exercise
Post-Lab Questions
1. At what magnification do you first notice the ragweed pollen?
1000x
2. Which is bigger, a rhinovirus or E. Coli?
E. Coli
3. Based on the magnification, how many of the E. Coli can fit into the same space as the head of a pin?
10000 E. Coli
4. About how many red blood cells could fit across the diameter of a human hair (again, look at the magnification scale)?
1000 Red Blood Cells
Experiment 2: Virtual Microscope
Post-Lab Questions
1. What is the first step normally taken when you look through the ocular lenses?
Adjusting the ocular
2. What is the highest objective lens you can use to see the entire letter e?
10x
3. The nuclei (the structure inside a cell that contains DNA) of the cheek cells have been stained using a special dye so that they appear purple. What shape are they?
Oval
4. At high magnification, you may notice that not all of the nuclei in the onion root tip slide appear as the shape you described in the question above. What do they look like?
Also oval
5. After completing the m1 exercise in the “Try this” section, how tall is the letter e?
150