Ray tracing for a flat mirror shows that the image is located a distance behind the mirror

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Ray tracing for a flat mirror shows that the image is located a distance behind the mirror equal to the distance of the object from the mirror. This is stated di = -do, since this is a negative image distance (it is a virtual image). 

(a) What is the focal length of a flat mirror?

(b) What is its power?Flat mirror do d

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