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An object placed 12.40 cm from a concave spherical mirror produces a real image 7.80 cm...

An object placed 12.40 cm from a concave spherical mirror produces a real image 7.80 cm from the mirror. If the object is moved to a new position 20.0 cm from the mirror, what is the position of the image?

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Answer #1

1/ object distance + 1/ image distance = 1/focal length

1/12.40 + 1/7.80 = 1/f

f = 4.788

Use your 1/x or x^-1 button

1/20 + 1/image = 1/4.788

Image distance = 6.295 cm

I hope it was helpful.. please rate me positive

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