Question

Asked Nov 16, 2019

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Ch 26, problem 7

An object is 21.0 cm from a converging lens, and the image falls on a screen. When the object is moved 3.50 cm closer to the lens, the screen must be moved 2.20 cm farther away from the lens to register a sharp image. Determine the focal length of the lens.

Step 1

According to the lens equation,

Step 2

the value of the image distance can be ...

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