Question

Question 22:

Polyster 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,when the fiber or filament is twisted upon itself in the yarn 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?​

Answer 1

Answer:

Lustre depends on the way light is reflected by the fibre and is determined by its cross-sectional shape. Lustre is an important aesthetic. Lustre results from the way light are reflected from a surface. .