Im having trouble with some lenses questions in physics...?

  • Thread starter Thread starter Tyler A
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Tyler A

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A stamp collector wants to magnify images by 5.0 when the object is 5.6 cm from the lens. What focal length lens is needed?

A lens is needed to create an inverted image twice as large as the object when the object is 18.0 cm from the lens. What focal length lens is needed?

I actually need to know what to do, not just the answer. Appreciate any help you can give me! I have the lense equation (1/f)=(1/distance of Image)+(1/distance of original)
 
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