For example, these are used
as a ‘light pipe’ to facilitate visual examination
of internal organs like esophagus, stomach
and intestines You might have seen a
commonly available decorative lamp with fine
plastic fibres with their free ends forming a
fountain like structure The other end of the
fibres is fixed over an electric lamp When the
lamp is switched on, the light travels from the bottom of each fibre and
appears at the tip of its free end as a dot of light