3B Scientific SEK Optics - Manual (Page 17)

Exercise
Examine the incident light on a bent reflecting surface (concave mirror)!
What do we need?
1 Optical lamp
with power supply unit
1 Base plate
1 Universal mirror
1 Screen
1 Three-slot aperture
1 Mask
additionally required:
1 Ruler
1 Coloured pen
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 mirror on the screen and bend it as marked on the mask!
5. Insert the three-slot aperture into the aperture holder!
6. Observe the beam of light after hitting the concave mirror! Draw the beam of light on the mask!
7. Determine the distance between concave mirror and focal point and therefore the focal length!
8. Draw five incident beams of light and the respective reflected beams of light (sketch)!
9. Change the curvature of the concave mirror! Use a coloured pen to draw the concave mirror with
the changed curvature on the mask! Repeat exercises 6 and 7!
ELWE Physical experiments for education in natural science and engineering
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1 SEG - OP 2.2 Collecting Light with a Concave Mirror