Question 1027470
{{{1/f=1/u+1/v}}}
{{{1/(1/f)=1/(1/u+1/v)}}}
{{{f=(uv/uv)(1/(1/u+1/v))}}}
{{{f=uv/(v+u)}}}
The others are solved the same way.
{{{1/v=1/f-1/u}}}
Then work it the same way and
{{{1/u=1/f-1/f}}}
Same way
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What is the object? A tube?
Please repost with additional information.