3B Scientific SEK Optics - Manual (Page 25)

Exercise
Examine the way light reacts at the transition from air to glass!
What do we need?
1 Optical lamp
with power supply unit
1 Base plate
1 Screen
1 Semicircular glass object
(flat design)
1 Single-slot aperture
1 Mask
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 semicircular glass object onto the middle of the screen as marked on the mask!
5. Insert the single-slot aperture into the aperture holder on the optical lamp!
6. First, the light should hit the plane on the glass object along the optical axis! Observe the light
when it passes the glass object1! Record your observations in the table!
7. Change the position of the optical lamp, so that the light hits the centre of the glass plate at an an-
gle! Observe and record your observation!
8. Change the position of the optical lamp twice, so that the light hits the semicircular glass object at
different angles! Observe and record your observations in the table!
9. If the path of light is reversible, it is possible to set up a statement on the way the light reacts at the
transition from glass to air! Formulate the statement!
ELWE Physical experiments for education in natural science and engineering
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1 SEG - OP 3.1 Refraction for the Transition from Air to Glass