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# Problem: A lens with a focal length of 25 cm is placed 45 cm in front of a lens with a focal length of 5.0 cm. a. How far from the second lens is the final image of an object infinitely far from the first lens? b. Is the image in part a in front of or behind the second lens?

###### FREE Expert Solution

Lens equation:
$\overline{)\frac{\mathbf{1}}{{\mathbit{s}}_{\mathbit{o}}}{\mathbf{+}}\frac{\mathbf{1}}{{\mathbit{s}}_{\mathbit{i}}}{\mathbf{=}}\frac{\mathbf{1}}{\mathbit{f}}}$

a.

For the first lens, the object is at infinity. The image is formed at the focal point of the first lens.

The distance of the image from the second lens is:

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###### Problem Details

A lens with a focal length of 25 cm is placed 45 cm in front of a lens with a focal length of 5.0 cm.

a. How far from the second lens is the final image of an object infinitely far from the first lens?

b. Is the image in part a in front of or behind the second lens?

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Thin Lens And Lens Maker Equations concept. You can view video lessons to learn Thin Lens And Lens Maker Equations. Or if you need more Thin Lens And Lens Maker Equations practice, you can also practice Thin Lens And Lens Maker Equations practice problems.

What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor McMillan's class at GSU.