Q. 225.0( 1 Vote )

# (a) Draw a ray di

Answer :

(a) 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.

(iii) Diminished.

(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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