When an object is placed any-where between infinite and optical center of a concave lens, the image formed is
(i) Between O and F.
(ii) Virtual, erect.
(b) CB = - u
CF = - f
CB' = - v
The relation between u, v and f is given by the lens formula:
As both u and v are negative the above equation will change to
We know that the focal length of a concave lens is negative, so the above equation will be changed to,
(c) Magnification m = -1
v = +40 cm (real and inverted)
Nature of the lens = ?
Power of the lens, P = ?
According to the lens formula,
Thus, focal length = 20 cm
Because the focal length is positive, thus it is convex lens.
Since power of lens is positive, lens will be converging in nature.
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