Consider an object with s=12 cm that produces an image with s\'=15 cm. Note that

Question

Consider an object with s=12 cm that produces an image with s'=15 cm. Note that whenever you are working with a physical object, the object distance will be positive (in multiple optics setups, you will encounter "objects" that are actually images, but that is not a possibility in this problem). A positive image distance means that the image is formed on the side of the lens from which the light emerges.

Part K Find the focal length of the lens. Express your answer in centimeters, as a fraction or to three significant figures.

Explanation / Answer

using lens -maker formual 1/u+1/v = 1/f 1/12+1/15 = 1/f so f = 20/3=6.667 cm

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