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Question: 

How far from a concave mirror (radius 21.0 cm) must an object be placed if its image is to be at infinity?

Source: Giancoli, Douglas C., Physics: Principles with Applications, 7th Edition, 2014.

Quick Answer: 

$10.5 \textrm{ cm}$

Giancoli 7th Edition, Chapter 23, Problem 9

(0:46)

Chapter 23, Problem 9 is solved.

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