A lens has a focal length of f=20 cm If an object is at o=50 cm, where is theima

Question

A lens has a focal length of f=20 cm If an object is at o=50 cm, where is theimage? If the image is real, what kind of lens isit? What is the magnification of theobject? Is this type of lens used to correct nearsighted or farsightedvision A lens has a focal length of f=20 cm If an object is at o=50 cm, where is theimage? If the image is real, what kind of lens isit? What is the magnification of theobject? Is this type of lens used to correct nearsighted or farsightedvision Is this type of lens used to correct nearsighted or farsightedvision

Explanation / Answer

Given that the focal length of lens is f = 20 cm object distance is u = 50 cm --------------------------------------------- Now   the image distance            1 / f = 1 / u + 1 / v                1 / 20 cm = 1/50 cm + 1/ v Then      v = 33.33 cm Lens is converging lens magnification is m = - u / v                            = - 1.5

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