1. The Compound Microscope

2. A B F E H J G I C K D L M A. Eyepiece B. Body Tube
C. Coarse Adjustment F
D. Fine Adjustment E H
E. Arm
Medium (10x)
F. Revolving Nosepiece J G
G. High Power Objective I
H. Low Power Objective C
I. Stage Clips K D
J. Stage L
K. Diaphragm M
L. Light Source (Lamp)
M. Base

3. A Compound Microscope has 2 Lenses
A compound light microscope uses two lenses to make an image look bigger. One is the eyepiece lens and the other is the objective lens. Each lens bends the light making the image look larger.
THINK! - What is the magnification number on the eyepiece?
10x
THINK! - What is the magnification number written on each objective lens?
low power: 4x
medium power: 10x
high power: 40x

4. Calculating Total Magnification
To figure out the total magnification use this equation:
Total Magnification (x) = Eyepiece Mag. x Objective Mag.
THINK! - Use the equation above to calculate total magnification.
Total Magnification under Low power=
10 x 4 = 40x
Total Magnification under Medium Power =
10 x 10 = 100x
Total Magnification under High Power =
10 x 40 = 400x

5. Extra Practice Eyepiece Objective Lens Total Magnification a) 10x 10x
b) 10x
44x
c) 5x
d) 20x
e) 20x
40x
100x
440x
50x
200x
800x
**Practice Website: