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
​

in progress 0
Thông Đạt 4 years 2021-08-28T07:53:36+00:00 1 Answers 21 views 0

Answers ( )

  1. Helga
    0
    2021-08-28T07:54:58+00:00
    Reply

    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

Leave an answer

Browse

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