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- Thread starter Kuzon
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- #2

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The lens equation is :- 1/f = 1/v - 1/u

Where v:- image distance with sign convention

u:- object distance with sign convention

just take reciprocal of whole eqn

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

## f = \frac{1}{\frac{(u-v)}{uv}} ##

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

Clearly it is self explanatory.

- #3

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That is not the lens eqn.

The lens equation is :- 1/f = 1/v - 1/u

Kuzon has written a perfectly acceptable version of the lens equation, one that is commonly used.

Kuzon: raising to a power does not follow a distributive law as does multiplication. So we have a(b + c) = ab + ac but (b + c)

- #4

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Kuzon has written a perfectly acceptable version of the lens equation, one that is commonly used.

Kuzon: raising to a power does not follow a distributive law as does multiplication. So we have a(b + c) = ab + ac but (b + c)^{2}≠ b^{2}+ c^{2}.

Sorry, I did not know that version of lens equation; as in our country the lens equation version used is different.

- #5

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- #6

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Sorry, I did not know that version of lens equation; as in our country the lens equation version used is different.

You must use a different sign convention. See, for example, the section "Imaging properties" on this page: https://en.wikipedia.org/wiki/Lens_(optics)#Thin_lens_approximation

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