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JEE Advanced 2022 Paper 1
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© examsnet.com
Question : 36
Total: 54
List I contains four combinations of two lenses ( 1 and 2 ) whose focal lengths (in
cm
) are indicated in the figures. In all cases, the object is placed
20
cm
from the first lens on the left, and the distance between the two lenses is
5
cm
.List II contains the positions of the final images.
.
List-I
List-II
(I)
(P)
Final image is farmed at
7.5
cm
on the right side of lens
2
.
(II)
(Q)
Final image is formed at
60.0
cm
on the right side of lens
2
.
(III)
(R)
Final image is formed at
30.0
cm
on the left side of lens
2
.
(IV)
(S)
Final image is formed at
6.0
cm
on the right side of lens
2
.
(T)
Final image is formed at
30.0
cm
on the right side of lens
2
.
Which one of the following options is correct ?
I
→
P
,
II
→
R
,
III
→
Q
,
IV
→
T
I
→
Q
,
II
→
P
,
III
→
T
,
IV
→
S
I
→
P
,
II
→
T
,
III
→
R
,
IV
→
Q
I
→
T
,
II
→
S
,
III
→
Q
,
IV
→
R
Validate
Solution:
(I)
v
1
=
uf
u
+
f
=
(
−
20
)
(
10
)
(
−
20
)
+
(
10
)
=
+
20
u
2
=
+
15
v
2
=
(
15
)
(
15
)
(
15
)
+
(
15
)
=
+
7.5
(II)
v
1
=
+
20
u
2
=
+
15
v
2
=
(
15
)
(
−
10
)
(
15
)
+
(
−
10
)
=
−
30
(III)
v
1
=
+
20
u
2
=
+
15
v
2
=
(
15
)
(
−
20
)
(
15
)
+
(
−
20
)
=
60
(IV)
v
1
=
(
−
20
)
(
−
20
)
(
−
20
)
+
(
−
20
)
=
−
10
u
2
=
−
15
v
2
=
(
−
15
)
(
10
)
(
−
15
)
+
(
10
)
=
30
© examsnet.com
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