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Refraction at Curved Surfaces

Let us assume...

Question

Let us assume a system that consists of two lenses with focal length $f_{1}$ and $f_{2}$ respectively. How do you find the focal length of the system experimentally, when two lenses are touching each other

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Solution

we can try to form sharp image of distant objects on a screen formed by the combination of lens. So the distance between lens and screen is focal length of the combination.

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