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
Solar eclipse will take place when

the moon does not lie on the line joining the sun and the earth
the sun is between the moon and the earth
the earth is between the moon and the sun
the moon is between the sun and the earth

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