3B Scientific SEK Optics - Manual (Page 45)

Exercise
Examine the way the light reacts when it passes through a dispersing lens!
What do we need?
1 Optical lamp
with power supply unit
1 Base plate
1 Screen
1 Dispersing lens (flat design)
1 Three-slot aperture
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 in front of the optical lamp!
4. Place the dispersing lens in front of the optical lamp as marked on the mask!
5. Observe the wide beam of light!
6. Insert the three-slot aperture into the aperture holder, observe the beam of light and draw it onto
the mask!
7. Draw a sketch and label it!
8. Determine the focal point for the dispersing lens by drawing the back extensions of the three re-
fracted beams of light!
9. Measure the focal length of the lens!
ELWE Physical experiments for education in natural science and engineering
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1 SEG - OP 4.4 Refraction on a Dispersing Lens