3B Scientific SEK Optics - Manual (Page 35)

Exercise
Examine the way light reacts when it passes through a prism!
What do we need?
1 Optical lamp
with power supply unit
1 Base plate
1 Screen
1 Prism
1 Single-slot aperture
1 Mask
additionally required:
2 Coloured pens
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 prism onto the centre of the screen as marked on the mask! Observe the beam of light
when the incident light is parallel to the optical axis!
Change the position of the optical lamp, so that the light from the optical lamp hits the cathetus sur-
face on the prism from the right!
5. Insert the single-slot aperture into the aperture holder!
6. Complete the column titles in the table!
7. Adjust an angle of incidence of 45° and determine the angle at which the light emerges from the
prism! Enter the measured values in the table! Draw the beam of light on the mask!
8. Repeat the experiment by directing the light onto the cathetus surface at an angle of incidence of
α = 35° and 55°! Use pens with different colours!
9. Draw a true-to-scale path of beams!
10. Describe the result!
ELWE Physical experiments for education in natural science and engineering
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1 SEG - OP 3.6 Light Curve on a Prism