Answer:
In the
lens formula,
we find
that u and v are reversible. Therefore, there are two positions of the object,
for which there will be an image on the screen.
Let
the first position be when lens is at C, Fig. 6(EP).ll.
= distance between source (O) and
screen .
or
Put
in (i)
or .
and
Thus
if object distance is ,
then
image distance is
Again,
if object distance is , then image
distance is
The
distance between two positions of the lens for these two object distances is
If
, then
Magnification,
If
, then
Magnification.
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