alleryThe critical angle of water with respect to air is about:
A58.75
B68.75
C48.75
D38.75
Answer & Solution
Correct answer: C. 48.75
1. Water has a refractive index of 1.33.
2. Its critical angle with respect to air is 48.75 degrees.
3. So the correct answer is 48.75.
_Source: syllabus Physics Part II, Ch 9 'Ray Optics and Optical Instruments'_
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