Thistle Scattering

Thistle scattering Thistle scattering

These parachutes on thistle seeds provided an attractive display and showed some interesting scattering and diffraction effects.

Viewed close to the sun the fibres at right angles to the sun scatter more strongly, resulting in a circular pattern around the sun.

Thistle scattering Thistle scattering

More of the arcs are visible here along with out of focus colours caused by diffraction.

Individual fibres radial to the sun appear quite dull here while the parts of fibres which are at right angles to the sun show strong scattering and diffraction.

Thistle scattering

A closeup showing various degrees of out of focus fibres and their bright diffraction colours.

Canon EOS 400D   12th August 2007
Wiltshire, England

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