Answer to Question #127451 in Optics for Lusapho

Question #127451
What is the nature and the focal length of the lens that will form virtual image having one quarter the dimensions of an object spaced 40cm from the lens
1
Expert's answer
2020-07-27T09:35:36-0400

Focal length is given by;

1u+1v=1f\frac{1}{u}+\frac{1}{v}=\frac{1}{f}

110+140=1f\frac{1}{10}+\frac{1}{40}=\frac{1}{f}

solving you find18\frac{1}{8}

Therefore, the focal length is 8 cm.

The nature of the lens is convex because the power is positive

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