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Standard XII
Physics
Common Rays in Thin Lenses
An object pla...
Question
An object placed 50 cm from a lens produces a virtual image at a distance of 10 cm from the lens. Find the focal length of the lens and also state the type of the lens used.
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Solution
Given,
Object
distance
,
u
=
-
50
cm
Image
distance
,
v
=
-
10
cm
(
virtual
image
is
formed
on
the
left
side
of
the
lens
)
Now
,
using
the
lens
formula
,
1
v
-
1
u
=
1
f
1
f
=
1
(
-
10
)
-
1
(
-
50
)
=
1
-
10
+
1
50
=
-
5
+
1
50
=
-
4
50
or
f
=
-
50
4
=
-
12
.
5
cm
Since
the
focal
length
is
negative
,
it
will
be
a
concave
lens
.
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