alleryThe critical angle is the angle of incidence for which refraction is:
A30 degrees
B90 degrees
C70 degrees
D50 degrees
Answer & Solution
Correct answer: B. 90 degrees
1. Beyond this angle Snell's law cannot be satisfied.
2. The critical angle corresponds to an angle of refraction of 90 degrees.
3. So the correct answer is 90 degrees.
_Source: syllabus Physics Part II, Ch 9 'Ray Optics and Optical Instruments'_
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