Question
(i) What is a lens formula? (ii) State it.
✓
Answer
(i) The relationship between the object distance $( u )$, image distance $( v )$ and focal length $(J)$ of a lens is called the lens formula.
(ii) It is $\frac{1}{v}-\frac{1}{u}=\frac{1}{f}$
[Note: The lens formula holds good for all values of $u$ and $v$ and is applicable to a convex lens as well as a concave lens. The sign convention for $u$, $v$ and $f$ must tie used in solving numerical examples.]
(ii) It is $\frac{1}{v}-\frac{1}{u}=\frac{1}{f}$
[Note: The lens formula holds good for all values of $u$ and $v$ and is applicable to a convex lens as well as a concave lens. The sign convention for $u$, $v$ and $f$ must tie used in solving numerical examples.]
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