Rainbow is formed due to the dispersion of light suffering refraction and TIR in the droplets present in the atmosphere. Observer should give with its back towards sun to observe rainbow.
![2441_Rainbow.png](https://www.expertsmind.com/CMSImages/2441_Rainbow.png)
Primary rainbow:
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Secondary rainbow:
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(i) Two refraction and one TIR.
(ii) Inner arc is violet outer is red.
(iii) Subtends an angle of 42° at the eye of the observer.
(iv) More bright
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(i) Two refraction and two TIR.
(ii) Innermost arc is red and outermost is violet.
(iii) It subtends an angle of 52.5°.
(iv) Comparatively less bright.
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