Question

Elaborate on the different methods that can be used for finding
the image position

in a setup having a combination of lenses?

Answer #1

We can use combination of two convex lens whose focal length is known to us. We can determine the image position .

Let say first convex lens's focal length is f1 so place your object f1 cm distance from this lens on left for this case image position will be at infinity means light rays become parallel to the axis.

Because

So if u1 =f1 then

V1 =infinite

So when this parallel rays fall at the lens 2 of focal length f2 then final image will be formed at f2 distance from second lens.

So if u2 =infinite

V2 = f2

So this how by placing second lens we can easily estimate that the position will be formed at focal length of second lens.

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