Deduce the expression m= f/f+u for a spherical lens [where symbols have their usual meaning].
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To derive:
m = f/(f + u) , for a lens .
Derivation:
We know that : for a lens, the magnification is equal to the ratio of the image distance and object distance.
Applying Len's Equation:
Multiplying numerator on both sides with 'u':
- u/v can be written as 1/m.
[Hence Derived].
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