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JEEMAIN and NEET
>>
Physics
>>
Class12
>>
Ray Optics and Optical Instruments
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Q)
An object is placed at
A
(
O
A
>
f
)
Here, f is the focal length of the lens. The image is formed at B, A perpendicular is erected at 0 and C is chooses such that
∠
B
C
A
=
90
∘
. Let
O
A
=
a
,
O
B
=
b
and
O
C
=
c
then f is :
(
a
)
c
2
a
2
+
b
2
+
c
2
(
b
)
c
a
+
b
(
c
)
c
2
a
+
b
(
d
)
N
o
n
e
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