Question

why are the silk fiber are lustrous
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Answer 1

Explanation:

The protein fiber of silk is composed mainly of fibroin and is produced by certain insect larvae to form cocoons. ... The shimmering appearance of silk is due to the triangular prism-like structure of the silk fibre, which allows silk cloth to refract incoming light at different angles, thus producing different colors.

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Answer 2

Answer:

Silk is made by silk fibres produced by silkworm. They have a characteristic triangular arrangement of protein strands which give it's a lustrous appearance. Also the way in which it is woven into a fabric can enhance its lustre.

Explanation:

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