- #1

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## Homework Statement

If anyone can help me, i would really appreciate it! thanks

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- Thread starter Aikenfan
- Start date

- #1

- 48

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If anyone can help me, i would really appreciate it! thanks

- #2

- 48

- 0

would i do:

15.5^-1 - 2.96^-1

Ans^-1

-3.658

15.5^-1 - 2.96^-1

Ans^-1

-3.658

- #3

hage567

Homework Helper

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- #4

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1/15.5 = 1/2.96*o + 1/o

Im sorry i believe i typed that wrong the first time, i forgot the "o" after 2.96

do i find the common denominator, i am not sure what to do

Im sorry i believe i typed that wrong the first time, i forgot the "o" after 2.96

do i find the common denominator, i am not sure what to do

Last edited:

- #5

hage567

Homework Helper

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1/15.5 = 1/2.96*o + 1/o

Im sorry i believe i typed that wrong the first time, i forgot the "o" after 2.96

do i find the common denominator, i am not sure what to do

You are still forgetting the negative sign in the M equation. To find "o", you can just take it out so you will have (1/o)*(1-(1/2.96)) on the right side of the lens equation. You can then cross multiply to solve for "o".

Once you get your answer for "o", find "i". You can put them both back into the lens equation and check if they are right, since you were given f.

- #6

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so o is equal to 0.663?

Last edited:

- #7

hage567

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- #8

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when i cross multiply, i get:

15.5 (0.663)

=

10.2765

does that look correct?

15.5 (0.663)

=

10.2765

does that look correct?

Last edited:

- #9

hage567

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Yes, I think that looks OK.

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