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Sodium bicarbonate Chemical formula CaCO3
Calcium carbonate is a odourless chemical compound. It is water insoluble source of calcium. It is mainly found in rocks and is carbonic salt of calcium.
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1 dioptre is SI unit of the power of a lens whose focal length is 1 metre. It is denoted by the letter D. Thus 1D = 1 m-1 . Simply, when focal length ‘ f ‘ is expressed in metres, then, power is expressed in dioptres. The power of a convex lens is positive and that of a concave lens is negative.
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