A lens of focal length 12cm forms an three times the size of the to the object. The distance between the object and the image is

Question

A lens of focal length 12cm forms an
three times the size of the
to the object. The distance between the object and the image is what

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Thông Đạt 2 months 2021-08-28T07:53:36+00:00 1 Answers 0 views 0

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    2021-08-28T07:54:58+00:00

    b) 16 cm


    Magnification, m = v/u


    3 = v/u


    ⇒ v = 3u


    Lens formula : 1/v – 1/u = 1/f


    1/3u = 1/u = 1/12


    -2/3u = 1/12


    ⇒ u = -8 cm


    V = 3 × (-8) = -24


    Distance between object and image = u – v = -8 – (-24) = -8 + 24 = 16 cm

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )