3B Scientific SEK Optics - Manual (Page 53)

Exercise
Examine which laws apply to images with focusing lenses!
What do we need?
1 Optical lamp
with power supply unit
1 Base plate
1 Screen
1 Aperture holder
1 F aperture
1 Focusing lens “+100”
1 Focusing lens “+50”
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. Place the screen on the right side outside the base plate!
4. Place the “+50” lens in front of the optical lamp!
5. Insert the F aperture into the aperture holder and place both in front of the optical lamp!
6. Place the “+100” focusing lens between the aperture holder and the screen as marked on the mask!
7. Adjust an object distance of 20 cm!
8. Focus the object! Move the screen until you can see a focused imaged on it!
9. Measure the object size, the image distance and the image size! Enter the values in table 1!
10. Repeat the measurement with object distances of 11 cm, 13 cm, 15 cm, 17 cm and 19 cm! Form
the quotients and enter them in columns 3 and 6!
11. Form the equation for the image magnification!
12. Use the measured values from table 1 for table 2 and form the lens equation!
ELWE Physical experiments for education in natural science and engineering
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1 SEG - OP 4.8
Lens Equation and
Equation for the Image Magnification