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Light being entirely reflected back into the first medium is a condition called:
AComplete optical absorption
BSelective wave dispersion
CTotal internal reflection
DPartial external refraction
Answer & Solution
Correct answer: C. Total internal reflection
1. The condition has a standard name.
2. Beyond the critical angle, no light crosses into the second medium.
3. All of the light is reflected back into medium 1.
4. That condition is called total internal reflection.
_Source: OpenStax College Physics for AP Courses 2e (CC BY 4.0), Ch 25 'Geometric Optics', sections 25.1-25.7_
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