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Pick the wrong answer in the context with rainbow.

1. When the light rays undergo two internal reflections in a water drop, a secondary rainbow is formed.
2. The order of colours is reversed in the secondary rainbow.
3. An observer can see a rainbow when his back is towards the sun.
4. A rainbow is always a semicircular arc.

Correct answer: A rainbow is always a semicircular arc.

Solution

A rainbow is not always a semicircular arc; its shape depends on the observer's position and the horizon. It can appear as a full circle if viewed from an elevated position, such as an airplane.

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