3B Scientific SEK Optics - Manual (Page 71)

Exercise
Examine the operating principle of a microscope!
What do we need?
1 Optical lamp
with power supply unit
1 Base plate
1 Screen
1 Aperture holder
1 Focusing lens “+100”
1 Focusing lens “+50”
1 Piece of transparent paper,
5 cm
× 5 cm
1 Mask
additionally required:
1 Ruler
Conducting the experiment
1. Attach the mask to the base plate!
2. Place the optical lamp on the left side of the base plate, so that the light emerges conically to the
right!
3. Insert the square sheet of transparent paper into the aperture holder! Place the aperture holder in
front of the optical lamp!
4. Use the structure of the transparent paper as a microscopic sample!
5. Use the “+100” lens as a projection lens and place it onto the spot marked on the mask!
6. Project the object (structure of the transparent paper) onto the screen and focus it! The screen
must be placed at a distance of approx. 40 cm from the projection lens!
7. Remove the screen and hold a “+50” focusing lens in front of the eye! Hold the lens, so that it acts
as a magnifying glass!
8. Name the parts of a microscope!
9. Record the function of each part!
ELWE Physical experiments for education in natural science and engineering
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1 SEG - OP 6.3 Microscope