Physics
Find the power of a convex lens if the image formed is at a distance of 16 cm from the lens when the object is placed on the other side of the lens at 20 cm from the optical centre?

11.25 diopters
-11.25 diopters
3.75 diopters
-3.75 diopters

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Physics
Rainbow is due to

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

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