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draw a ray diagram for this A concave mirror with a focal length of 10.0 cm...

draw a ray diagram for this

A concave mirror with a focal length of 10.0 cm creates a real image 30.0 cm away on its principal axis; the corresponding object is located how far from the mirror?

Use the mirror equation:

1/di + 1/do = 1/f

where di = +30 cm and f = +10 cm.

Substitute and solve for do.

1/do + 1/(30 cm) = 1/(10 cm)

1/do = 1/(10 cm) - 1/(30 cm) = 2/(30 cm)

do = 15 cm

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