Physics: Converging and Diverging Lenses Help Please

  • #1
casiocasio442
1
0
Thread moved from the technical forums, so no Homework Template is shown.
Summary:: I cannot seem to get the answer to the following question.
For (a) I am using the formula 1/V= 1/U- 1/F, giving me 7.5cm. I am then adding this to 50cm to get 57.5cm. I then used -1/20-1/57.5-1/v to get **-14.9cm** which is Incorrect.
Any help greatly appreciated!

Screen Shot 2020-03-30 at 17.10.11.png
 

Answers and Replies

  • #2
Dr_Nate
Science Advisor
251
138
You could try drawing the ray diagrams to give you an idea of what the answer should be. That might help you think about what you need to do to actually calculate it.
 
  • #3
Merlin3189
Homework Helper
Gold Member
1,704
793
Have you tried 14.8?
 

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