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Polarised light
Polarised light
Light whose waves move in just one plane. Light waves normally arrive from many angles and
are not polarised. Light becomes polarised when it passes through
or bounces off certain substances. Water and metal turn ordinary
light into polarised light. Polarising sunglasses make use of this effect to eliminate the polarised light bounced from metal and water. That takes away the glare that polarisation produces.
 Polarised
light – If objects
are seen under two
sheets of polarising material
that have their polarising directions
crossed, patterns of stress can be seen. This
is used by engineers to design items that have as little concentrated stress as possible.
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