3B Scientific Light Box - Manual (Page 13)

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The other prisms can also be experimented with. Try to obtain at least five positions of the three prisms
(besides the above two), which result in internal reflection. Trace the ray diagrams, using different
color pencils for different rays.
• Try to set up the three prisms in such a manner that three rays are reflected internally by all three
prisms. (Optical-fiber technology is all about repeated total internal reflection).
• Many faint rays are seen while examining total internal reflection. What could be the reasons for
these rays?
• Mirages are an effect of total internal reflection. Can you explain how?
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°45°90° prisms are used in their light-reversing modes to shorten the length of telescopes.
Fig. 13
Fig. 14
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