Answer to Question #82850 in Optics for Khadeeja

Question #82850

Two thin lenses of focal length f, and f, are in contact. The focal length f of the lens combination is given by

Expert's answer

This combination of lenses behaves like a thin lens having a focal length F given by

1/F=1/f+1/f=2/f.

The focal length f of the lens combination is given by

F=f/2.

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