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A concave mirror having a radius of curvature 40 cm is placed in front of an illuminated point source at a distance of 30 cm from it.Find the location of the image.
I got 6cm as my answer and its wrong

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  1. C at 40
    F at 20

    object at 30, halfway between C and F
    so
    image is BEYOND C

    http://www.physicsclassroom.com/class/refln/Lesson-3/Image-Characteristics-for-Concave-Mirrors

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  2. 1/f = 1/do + 1/di

    1/20 = 1/30 + 1/di

    60/20 = 60/30 + 60/di

    3 = 2 + 60/di

    di = 60 cm

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