Question

which property of the coating on fiber - optic strands makes light visible only at the ends of the strands? reflectivity absorbency transparency translucency

Explanation:

The coating on fiber - optic strands has high reflectivity. This causes total internal reflection of light within the fiber, allowing light to travel along the length of the strand and be visible only at the ends. Absorbency would absorb light, transparency and translucency would not confine light to the ends.

Answer:

reflectivity