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Standard XII
Physics
Magnification by Thin Lenses
A diverging m...
Question
A diverging meniscus lens has a focal length of -20 cm. If the lens is held 10 cm from the object, the magnification is :
A
-0.667
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B
0.667
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C
-2
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D
2
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Solution
The correct option is
B
0.667
given
Focal length,
f
=
−
20
c
m
Object distance,
u
=
10
c
m
From len's formula
1
f
=
1
v
−
1
u
⇒
1
−
20
=
1
v
+
1
10
⇒
v
=
−
20
3
c
m
Magnification,
m
=
v
u
=
−
20
3
×
−
10
=
2
3
=
0.667
m
=
0.667
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