Letter | Published:

A Tertiary Rainbow


PROF. TAIT remarks, in his recently-published work on “Light,” that rainbows due to three or more internal reflections “are too feeble to be observed.” It may therefore be worth recording that a tertiary bow was clearly visible from Thandiani Hill, Punjab, one evening last week (August 17). The bow extended over an arc greater than a semicircle, but was broken in two places. The colours were as distinct as in many an ordinary bow.

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