Total Internal Reflection of Light
Critical angle · Two conditions · Prisms at work
Explain why r grows to 90° when light leaves a denser medium
Define the critical angle and read a table of critical angles
Define total internal reflection and state its two conditions
Explain why light follows a stream of water
Trace rays through equilateral and right-angled prisms
Explain its use in periscopes, SLR cameras and binoculars
From water into air, \( r > i \)
Increase i and r increases too
r can be at most 90°
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