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Unformatted text preview: end. Can you see out the sides of the block? How do the sides of the
When a light beam is transmitted, does all the light pass through the boundary? (Hint: look at where
the light enters the prism.) Given your observations, why do you think that the phenomenon studied here
is called “total internal reﬂection” rather than simply “internal reﬂection”? For your setup ﬁnd the critical
angle and the index of refraction of the prism. 7 Experiment: Dispersion Set up the multiple-ray projector to make a single ray. Try various combinations of voltages available at
the transformer to obtain a sufﬁciently bright ray. (The voltages add together between pairs of terminals.)
Danger: The ray projector will become hot!
In the last section, we assumed that n1 and n2 are relatively independent of λ . To see that this is not
exactly true, place the plastic 60◦ prism (Figure 3) into the light beam. Rotate the prism until you see a 5 TIR
α β θcrit
Figure 2: Setup for ﬁnding the angle of...
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- Spring '14