Two thin converging lenses are placed on a common axis, so that the centre of one of them coincides with the focus of the other. An object is placed at a distance twice the focal length from the left hand lens. Where will its image be? What is the lateral magnification? The focal of each lens is f.

Two thin converging lenses are placed on a common axis, so that the ce

1.	Two thin converging lenses are placed on a common axis, so that the centre of one of them coincides with the focus of the other. An object is placed at a distance twice the focal length from the left hand lens. Where will its image be? What is the lateral magnification? The focal of each lens is f.
Answer» Here,`f_(1)=+5.0 cm and f_(2)=-10.0 cm` Therefore, the combined focal length F is given by `1/F=1/(f_(1))+1/(f_(2))=1/5.0-1/10.0=+1/10.0` `therefore` F=+b10.0 cm i.e., the combination behaves as a converging lens of focal length 10.0 cm.

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Two thin converging lenses are placed on a common axis, so that the centre of one of them coincides with the focus of the other. An object is placed at a distance twice the focal length from the left hand lens. Where will its image be? What is the lateral magnification? The focal of each lens is f.

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