In this experimental setup the combination of concave lens and convex lens separated by a distance d behaves as a single lens of focal length f
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The focal length f of the combination will decreases.
- As given that the combination of concave lens and convex lens are separated by distance d and having focal length f
- Let the focal length of the concave lens be f₁ and focal length of convex lens be f₂
- Let the focal length of the combination be f₃.
- Now finding the relation
- 1/f₃=1/f₁+1/f₂-d/f₁f₂
- As they are in contact d=0
- Therefore 1/f₃=1/f₁+1/f₂
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