Which of the lines in the figure represents the normal to the surface at point P? 
A) 1
B) 2
C) 3
D) 4
E) none of the above
Correct Answer:
Verified
Q41: Why are optical fibers important for communication?
A)They
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Q45: Optical fibers work because of
A)interference.
B)diffraction.
C)total internal reflection.
D)diffuse
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Q59: Light spreads out when it passes through
Q60: Thin film interference is responsible for the
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