Question

3. (a) If the image formed by a lens is diminished in
size and erect, for all positions of the object, what
type
of
lens
is
it?
(b) Name the point on the lens through which a ray of
light passes undeviated.
(c) An object is placed perpendicular to the principal
axis of a convex 'lens of focal length 20 cm. The
distance of the object from the lens is 30 cm. Find
(i) the position (ii) the magnification and (iii) the
nature of the image formed. ​

Answer 1

Answer:

(a) The lens used is Concave lens.

(b) The point on the lens through which a ray of light passes undeviated is the Pole.

(c) The position of the image is +12cm , Its magnification is 2/5 cm and the nature of the image is Virtual.