In a fiber-optic cable, which phenomenon occurs for signal to propagat

1.	In a fiber-optic cable, which phenomenon occurs for signal to propagate along the inner core:
A.	Modulation
B.	Reflection
C.	Refraction
D.	All of the above
Answer» C. Refraction

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In a fiber-optic cable, which phenomenon occurs for signal to propagate along the inner core:

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