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Refraction of light: Thin Convex Lens

A thin lens forms an image of an overhead electric lamp on a piece of paper. The distance to the lamp from the lens is 148 cm; the distance to the paper from the lens is 16.0 cm. What is the focal length of the lens?

I need to see each step and formula to solve this question.

Solution Summary

The position of the image of an object is calculated with the use of lens formula. The solution includes a ray diagram.