- #1

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2. I tried using 1/f= 1/d0-1/di to solve for this. But it doesn't seem to be working.

Any suggestions.

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- Thread starter lenaosu
- Start date

- #1

- 2

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2. I tried using 1/f= 1/d0-1/di to solve for this. But it doesn't seem to be working.

Any suggestions.

- #2

alphysicist

Homework Helper

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The thin lens formula is

[tex]

\frac{1}{f}=\frac{1}{d_o}+\frac{1}{d_i}

[/tex]

Depending on the problem, any of these variables might turn out to be negative numbers. What numbers are you using, and what do you get?

- #3

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1.) 1/f-1/di=1/do

1/11-1/27=1/di

di=18.6cm

2.) 1/f-1/do=1/di

1/19-1/18.6=1/di

di= -883.5cm

My calculations for my second image doesn't seem correct. My image should be to the left of my lens and not to the righ tof my lens.

- #4

alphysicist

Homework Helper

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However, you should not round your result from step 1 to three digits. Keep all the digits you can, and then round the final answer. Here it makes a relatively large difference.

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