Question

Vu
Polyater fabric is lustrous, while cotton is not. Luster depends on the way light is reflected by
the fibre and is determined by its cross-sectional shape. Luster is an important aesthetic
property related to the reflection of light. For example, Silk is highly lustrous due to uniform
cross-sectional area of its fiber. Luster results from the way light is reflected from a surface.
The more lustrous a fiber, the more evenly does it reflects the incident light. Thus, the cross-
sectional shapes which can reflect the incident light most evenly will give a strong luster. But,
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Total 30 questions
when the fiber or filament is twisted upon itself in the yam and fabric, the incident light is not
reflected as evenly and it results in a softer luster.
The cross-sectional shapes of various fibres are given below. Which one of the following is
most likely the cross-sectional shape of a cotton fibre?
T!
4
a
B
3​

Answer 1

Answer:

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