3B Scientific SEK Optics - Manual (Page 47)

Exercise
Examine how selected beams of light reacts when passing 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 Single-slot aperture
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, so that it is flush with the right side of the base plate!
4. Insert the three-slot aperture into the aperture holder!
5. Place the dispersing lens as marked on the mask!
6. Use the three-slot aperture to determine the focal point of the dispersing lens on the mask! Mark
the focal point on the mask!
7. Replace the three-slot aperture by a one-slot aperture!
8. Generate a beam of light parallel to the optical axis by changing the position of the optical lamp!
Observe the beam of light when it passed through the lens!
Draw the beam of light onto the mask. Use a coloured pen!
9. Generate a beam of light which passes through the centre of the lens! Observe the beam when it
passed the lens! Draw the beam of light on the mask! Use a coloured pen!
10. Transfer the paths of beams into the sketch!
ELWE Physical experiments for education in natural science and engineering
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1 SEG - OP 4.5 Paths of Rays through a Dispersing Lens