3B Scientific SEK Optics - Manual (Page 57)

Exercise
Examine possible image defects!
What do we need?
1 Optical lamp
with power supply unit
1 Base plate
1 Screen
1 Focusing lens (flat design)
1 Three-slot aperture
1 Five-slot aperture
1 Aperture holder
1 Red coloured pen
1 Blue coloured pen
1 Mask
additionally required:
1 Ruler
Conducting the experiment
1
st
experiment
1. Attach the mask to the screen!
2. Place the optical lamp on the left side of the base plate, so that the light emerges parallel to the
right!
3. Place the screen in front of the optical lamp, so that it is flush with the right side of the base plate!
4. Insert the three-slot aperture into the aperture holder on the optical lamp!
5. Place the focusing lens on the screen as marked on the mask!
6. Use the three-slot aperture to produce three short focused parallel beams of light! Draw the broken
beams of light and the focal point! Measure the focal length and enter the value in table 1!
7. Replace the three-slot aperture by the five-slot aperture! The two outer beams of light correspond
to the long focused parallel beams! Observe the beams of light when they pass through the lens
and mark the focal point! Now measure the focal length and enter the value in table 1!
8. How can image defects be corrected?
ELWE Physical experiments for education in natural science and engineering
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1 SEG - OP 4.9 Image Defects