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Byju's Answer
Standard X
Physics
Lens Formula
The focal len...
Question
The focal length of a lens is given by:
(Assume terms have standard meanings)
A
f
=
u
−
v
u
v
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B
f
=
u
v
u
−
v
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C
f
=
u
+
v
u
v
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D
f
=
u
v
u
+
v
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Solution
The correct option is
B
f
=
u
v
u
−
v
According to Lens formula:
1
f
=
1
v
−
1
u
where:
f
:
Focal length of the lens
v
:
Image distance
u
:
Object distance
Rearranging the terms, we get:
f
=
u
v
u
−
v
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