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;
"\\frac{1}{u}+\\frac{1}{v}=\\frac{1}{f}"
"\\frac{1}{10}+\\frac{1}{40}=\\frac{1}{f}"
solving you find"\\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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