3B Scientific SEK Optics - Manual (Page 27)

Exercise
Examine how the 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 in the middle as marked on the mask!
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 α = 20° by changing the position of the lamp and determine the an-
gle of refraction!
8. Repeat the experiment with the following angles of incidence:
α = 30°, 40°, 50°, 60°, 70°!
Enter the values in the table!
9. Determine the sinus for each angle and calculate the quotient for the sinuses of the angle of inci-
dence and the angle of refraction!
10. Formulate the law of refraction for the transition of the light from air to glass!
11. Calculate the quotient from column 3 and column 4 and enter the value in column 5 of the table!
What feature is characterised by the quotient?
ELWE Physical experiments for education in natural science and engineering
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1 SEG - OP 3.2 Law of Refraction, Determining the Refractive Index