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Q.

Lens formula is expressed as :

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a

$\frac{1}{v} - \frac{1}{u} = \frac{1}{f}$

b

$\frac{1}{u} - \frac{1}{v} = \frac{1}{f}$

c

$\frac{1}{v} + \frac{1}{u} = - \frac{1}{f}$

d

$u + v = f$

answer is A.

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Detailed Solution

The lens formula refers to the relationship between an object's distance, the image's distance, and the focal length.
The lens formula is written as: $\frac{1}{v} - \frac{1}{u} = \frac{1}{f}$
In this case, u stands for the object distance, v for the image distance, and f for the focal length of the lens.

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