Polarisation of Light
 Constantine
Bay, Cornwall. No filter. |
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Horizontally
polarised light only. |
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Vertically
polarised light only. |
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POLARISER: Here light from a
flash has been bounced from an air-water boundary to illuminate
the buildings beyond. In this case the light striking the surface
being split into two components of opposite polarisation, the
horizontally polarised component being reflected and the vertically
polarised component entering the water. A polarising filter fitted
to the camera can be rotated to enhance either the surface reflections
or the view beneath the water. R92K08-37 |
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→ When assessing underwater
conditions from above, Polaroid (or polarised, or anti-glare)
sunglasses can be used to suppress reflections from the surface.
→ When browsing through sunglasses in a store, pick up two
pairs of alleged polarisers and look through two lenses at once,
with the plane of one rotated at 90° to the other. If the
combination goes dark, both pairs are genuine. |
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