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focal length help

Prokart2000
By Prokart2000
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hi guys

 

i need to know how to do this:

the object is 4cm away form the lens, the lens has a focal length of 12cm, calculate the distance.

can someone show me how to do it?

p.s sorry for being in active, ive started playing rugby and test were at school

My Setup :P

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1/f = 1/Do + 1/Di

If the image is virtual then Di is negative

ok so how do i work it out from that, object is 4cm from lens, lens has a focal of 12xm

My Setup :P

Spoiler

Skylake: I7-6700|MSI B150 GAMING M3|16GB GSKILL RIPJAWS V|R9 280X (WILL BE 1070)|CRUCIAL MX300 + WD BLACK 1TB

 

 

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