3B Scientific SEK Optics - Manual (Page 41)

Exercise
Examine the way the light reacts when passing through a focusing lens!
What do we need?
1 Optical lamp
with power supply unit
1 Base plate
1 Screen
1 Focusing lens (flat design)
1 Mask
additionally required:
1 Ruler
Conducting the 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 on the base plate, so that it is flush with the right side of the base plate!
4. Place the focusing lens as marked on the mask!
5. Observe the beam of light and sketch the beams of light on the mask!
6. Determine the focal point and measure the focal length!
7. Draw three beams of light before and after passing through the focusing lens into the sketch!
8. One focusing lens is marked “+100”. What does it mean?
ELWE Physical experiments for education in natural science and engineering
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1 SEG - OP 4.2 Refraction on a Focusing Lens / Focal Length