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physics

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an object is placed 10 cm from a concave spherical mirror whose radius of curvature is 12 cm. What is the distance of image

a) 5cm
b) 10 cm
c)15cm
d)20cm
e)24cm

  • physics -

    The focal length is f = R/2 = 6 cm.
    1/do + 1/di = 1/10 + 1/di = 1/6
    1/di = 1/6 - 1/10 = 5/30 -3/30
    = 1/15
    image distance di = 15 cm
    object distance do = 10 cm

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