Page 10 - ตัวอย่าง Science Solution 1

Microscopes have enlarged understandings Eyepiece Lens Coarse Focus
about cells and organisms for over 200 years. But a
compound light microscope (an optical microscope) is
limited in a capability, which is the ability to magnify
objects that are not smaller than 0.2 micrometres. Arm
If an object is smaller than 0.2 micrometres, it will Objective Lenses
not be visible. Therefore, we are still not able to see
components of cells that are smaller than 0.2 Fine Focus
micrometres, even with a light microscope.

Stage Clips Stage Plate

Mirror
Arm

Eyepiece
Lenses Base

Coarse Objective
Focus Lenses Figure 1.10 A compound light microscope

Stage Clips

Fine Focus Stage Plate

Illuminator
Base

Figure 1.11 A dissecting microscope

How to Use a Light Microscope

1. Lift the microscope using one hand at
the arm and the other supporting the base in a
vertical manner in order to prevent components of the
microscope, such as the mirror and the eyepiece lens,
from misplacing.

Figure 1.12 Lift the microscope using one
hand at the arm and the other supporting the base.

Unit 1 Units of Organisms and Plants Life 17