physics

How far should and object be from a concave sperical mirror of radius 36cm to form a real image one-ninth it's size?

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  1. Let the object distance be Do. The image distance must be Di = Do/9 to achieve the desired magnification.

    The focal length of the mirror is
    f = R/2 = 18 cm

    Solve the basic equation
    1/Do + 1/Di = 1/f

    It isn't hard.

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  2. 180

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  3. 90

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