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:

Fiber - optic strands use total internal reflection. Reflectivity of the coating ensures that light is reflected within the strand and only exits at the ends. Absorbency would absorb light, transparency would let light pass through the sides (not desired here), and translucency is a partial - light - passing property which is not relevant for the described phenomenon.

Answer:

reflectivity