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JEE Main Physics Class 12 Ray Optics and Optical Instruments Part 1 Questions
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© examsnet.com
Question : 35
Total: 99
What is the position and nature of image formed by lens combination shown in figure?
(
f
1
,
f
2
are focal lengths)
[12 Jan. 2019 I]
70 cm from point B at left; virtual
40 cm from point B at right; real
20
3
cm from point B at right, real
70 cm from point B at right; real
Validate
Solution:
By lens's formula,
1
V
−
1
u
=
1
f
For first lens,
[
u
1
=
−
20
]
1
V
1
−
1
−
20
=
1
5
⇒
V
I
=
20
3
Image formed by first lense will behave as an object for second lens
so,
u
2
=
20
3
−
2
=
14
3
1
V
2
−
1
14
3
=
1
−
5
⇒
V
2
=
70
c
m
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