Basic optics question - lenses

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The discussion centers on the optical behavior of nested concave and convex lenses with equal focal lengths. When two lenses with identical focal lengths are combined, they do not produce convergence or divergence of light rays. However, if the concave lens has a larger focal length than the convex lens, the rays will converge slightly. This phenomenon can be explained using the lens maker's equation and the principles of optical power.

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Why if two concave and convex lenses are nested together, will there be no resulting convergence or divergence if their focal lengths are the same, but if the concave lens has a larger focal length the rays will converge slightly?

What is (are) the mathematical equation(s)/reason(s)?
 
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Hi jaejoon89! :smile:

"Nested" means that the radii of curvature are the same.

So what mathematical equations are involved? :wink:
 

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