no asked in Science & MathematicsPhysics · 4 months ago

a concave mirror has a curvature of 20 cm and a 1.5 cm object is placed 5 cm away from the mirror, where is the object ? (focal point etc)?

the p or the f?

1 Answer

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  • Anonymous
    4 months ago
    Best Answer

    focal point (distance from mirror) is:

    f = r/2 = 10 cm

    given

    s = object distance from mirror

    s' = image distance from mirror

    must be:

    1/s + 1/s' = 1/f

    1/s' = 1/f - 1/s = 1/10 - 1/5 = -1/10 =

    then the distance of the image (virtual) from mirror is

    s' = - 10 cm (behind the mirror)

    magnification is:

    M = s'/s = - 2 (image is inverted and doubled in size)

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