What is a rainbow?
Definition 1
Definition 2
An optical phenomenon that appears as an arc of the colours of the visible spectrum across the sky when falling water droplets are illuminated by sunlight from behind the observer. The colours are produced by refraction and internal reflection of the sunlight by the water drops.
Two bows may be visible, the inner ring being know as the primary bow and the outer, in which the colours are reversed, as the secondary bow (two internal refractions in the raindrop occur).
Go to About Rainbows for more information.
Go back to the main post of this week: Hong Kong case studies
Definition 2
An optical phenomenon that appears as an arc of the colours of the visible spectrum across the sky when falling water droplets are illuminated by sunlight from behind the observer. The colours are produced by refraction and internal reflection of the sunlight by the water drops.
Two bows may be visible, the inner ring being know as the primary bow and the outer, in which the colours are reversed, as the secondary bow (two internal refractions in the raindrop occur).
Go to About Rainbows for more information.
Go back to the main post of this week: Hong Kong case studies
posted by Eau at 11:08 pm
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