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Optics Problem with a Double Lens System

  • #1

Homework Statement


An object is 25.0 cm to the left of a lens with a focal length of + 15 .0 cm. A second lens of focal length +15.0 cm is 30.0 cm to the right of the first lens. Find the location of the final image and draw it out.

Homework Equations


1/f = 1/di + 1/do

The Attempt at a Solution



di=fdo/(do-f) = 37.5cm

The object of the second lens is the image of the first lens. This gives a second object distance of -7.5cm.

di2=f2do2/(do2-f2) = 5cm

Does this make physical sense? Would the second image be positioned to the right of the second lens in the diagram but to the left of the initial image?[/B]
 

Answers and Replies

  • #2
kuruman
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Does this make physical sense? Would the second image be positioned to the right of the second lens in the diagram but to the left of the initial image?
Yes and yes.
 

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