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January 28, 2015

January 28, 2015

Posted by **Laila** on Wednesday, March 27, 2013 at 10:14pm.

Find the focal length of this lens?

Please someone help me out I tried so many times i keep getting wrong answer.

PHYSICS PLEASE HELP ASAP - bobpursley, Wednesday, March 27, 2013 at 4:45pm

1/f=1/di+1/do

f=dido/(di+do)

but f before the move is f after the move, so

(di+6)(55+45)/(di+55+51)=di55/(di+55)

solve for di. Looks like fun.

then, after you get di, go for f from the lens equation

PHYSICS PLEASE HELP ASAP - Laila, Wednesday, March 27, 2013 at 6:48pm

I found this equation 5380di^2+600di+33000=0 and when i solve i got an imaginary number I had a hard time solving it so could you please help me out I actually redid it and got 3.15 for di i don't know if thats right or not an how to go from there cuz i keep gettind it wrong

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