Physics: Converging and Diverging Lenses

AI Thread Summary
The discussion revolves around solving a physics problem involving converging and diverging lenses. The user applies the lens formula but arrives at an incorrect value of -14.9 cm. Suggestions include drawing ray diagrams to visualize the problem better and considering an alternative answer of 14.8 cm. The conversation emphasizes the importance of understanding the lens formula and visual aids in solving optics problems. Clarification and additional guidance are sought to arrive at the correct solution.
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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!

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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.
 
Have you tried 14.8?
 
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