Physics
Rainbow is due to

diffusion of sunlight through water droplets
ionisation of water deposits
refraction and reflection of sunlight by water droplets
absorption of sunlight in minute water droplets

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Physics
An integrated circuit is more advantages than a coventional circuit because

They make the electric equipments more reliable and easier for servicing
A faulty part of a conventional circuit may be difficult to locate and repair
All listed here
If a part of the integrated circuit fails the entire circuit is simply replaced

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