According to lens formula, the focal length (f) of a lens is given by:
Object distance: $u$
Image distance: $v$

f = \frac{u v}{u - v}

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f = \frac{u - v}{u v}

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f = u v + u - v

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f = u v - u + v

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Solution

The correct option is A $f = \frac{u v}{u - v}$
According to lens formula,
$\frac{1}{f} = \frac{1}{v} - \frac{1}{u}$
$\frac{1}{f} = \frac{u - v}{u v}$
$f = \frac{u v}{u - v}$

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According to lens formula, the focal length (f) of a lens is given by: Object distance: u Image distance: v

The correct option is A f=uvu−vAccording to lens formula, 1f=1v−1u 1f=u−vuv f=uvu−v

According to lens formula, the focal length (f) of a lens is given by:
Object distance: $u$
Image distance: $v$

The correct option is A $f = \frac{u v}{u - v}$
According to lens formula,
$\frac{1}{f} = \frac{1}{v} - \frac{1}{u}$
$\frac{1}{f} = \frac{u - v}{u v}$
$f = \frac{u v}{u - v}$