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Wave Nature Of Light: Huygens Principle
a) Primary rainbow is formed by the rays which undergo one total internal reflection and two times refractions before emerging finally from the water droplets.
Secondary rainbow is formed by the rays which have undergone two total internal reflections and two times refraction before emerging finally from the water droplets.
(b) Primary rainbow is more brighter than the secondary rainbow.
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What type of wave front is produced by:
(i) Point source of light (ii) Line source of light
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