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Define lens equation or formula. Also write its equation.

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Define lens equation or formula. Also write its equation.

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Ans.  LENS FORMULA
The relation between the object and image distance from the lens in terms of the focal length of the lens is called lens formula.
It can be written as:
1 -1 -1 T - £ + q
This formula is valid both for concave and convex lenses.
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