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  4. Two plano-convex lenses of equal focal lengths are arranged as shown <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/physics/b9a882e6b31595c5ef58506c967bfd61-.png /> The ratio of the combined focal lengths is

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Q. Two plano-convex lenses of equal focal lengths are arranged as shown
image
The ratio of the combined focal lengths is

Ray Optics and Optical Instruments

Solution:

The power of lens remains the same no matter how the lenses are placed. So adding their power, the power and hence the combined focal length will remain same in all three cases.