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Focal lenght of lens

  • Thread starter dev-hud
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  • #1
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An object 5 cm tall is 10 cm from a convace lens. The resulting image is one fifth as large as the object. What is the focal lenght of the lens?

I have been doing questions involving focal lenght, but not when the resulting image is a fraction of the original image. i do not know where to start or what equation(s) to use?? :(
 

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  • #2
berkeman
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An object 5 cm tall is 10 cm from a convace lens. The resulting image is one fifth as large as the object. What is the focal lenght of the lens?

I have been doing questions involving focal lenght, but not when the resulting image is a fraction of the original image. i do not know where to start or what equation(s) to use?? :(
Use the lens equation. Can you show us what that is? And make a sketch. Could you show us a sketch of the situation?
 

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