Discussion
Silica fibres can change their optical properties permanently when they are exposed to :
Answer: C
Silica fibres change permanently when exposed to intense radiation from a laser in the blue/ultraviolet spectrum.
This is photosensitivity: germanium-doped silica absorbs ultraviolet light, around 240 nm, and its refractive index changes permanently. The effect is used to write fibre Bragg gratings by exposing the core to an ultraviolet interference pattern.
Red and green light are not absorbed strongly enough to cause the change, and electrical or electrostatic shocks do not alter the optical properties of glass in this way.
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