From Western Australia Perth photographer Colin Laianghate when traveling through Cottesloe beach, in a helicopter to capture a strange full circle rainbow.
Colin said that this landscape is very rare to take this view even more difficult.
Colin said: "We were at the end of a way to return the aerial helicopter after a shower when we pass through the region edge of the rain, the sun was setting, the position is very low, the sun just to create this strange rainbow it. in front of us is formed. "
So Colin took out the camera to capture under the formation of a full circle rainbow.
Colin 2002 photography, already 46 years old, he will be a full circle rainbow pictures to the Internet, received a lot of physics professor and astronomer reply.
According to the US National Aeronautics and Space Administration (NASA) introduced a full circular rainbow phenomenon and the observer position has a lot, mainly by reflecting sunlight inside the raindrops to form.
In fact, not a circular rainbow spectacle, on the plane to see the rainbow would be a full circle, drop round, rainbow reflected sunlight should be formed round, but on the ground-based observations is limited only Unable to see the full circular rainbow.
Rainbow is because the sun shines nearly circular air droplets, resulting from dispersion and reflection. When sunlight enters the water droplets simultaneously at different incident angles within the droplets Yiyi different angle reflection. Among 40 to 42 degrees to reflect the most intense, resulting in what we see the rainbow. When the result of this reflection, the sun drops into the first refracted once and reflected in droplets on the back, and then refracted again when the last to leave water droplets. Because water has a light dispersion effect, the refractive index of light of different wavelengths is different, the refraction angle of blue than red. Since the light is reflected in a drop of water, so the viewer saw the spectrum is reversed, the red light at the top, next to other colors.
In fact, the rainbow does not occur at a particular position in midair. It is an optical phenomenon seen by the viewer, the rainbow appears location will change as the viewer. When the observer see the rainbow, its location must be in the opposite direction of the sun. Central rainbow arch within, in fact, is reflected droplets, magnified image of the sun. So less than the outside rainbow sky rainbow brighter. Positive rainbow arched central location, just a shadow of the head of the observer direction, rainbow itself at the head of the observer's eye and the shadow line position above the 40 to 42 . So when the sun is in the sky above 42 degrees, the position of the rainbow will not be seen in the horizon. This is also the reason why the rainbow appears rarely noon.
If on the plane, you'll see the rainbow would be a full circle instead of the arch, while the center circle of the rainbow is the direction of travel of the aircraft. But should fully complete rainbow shot down is not easy, rainbow from one end to the other end, spanning 84 . In general 35mm camera focal length of 19mm or less need a wide-angle lens can be used only a single cell to the entire rainbow photographed.
(Comprehensive network of international observers online, Wikipedia and other reports)
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