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JEE Main Physics Class 12 Ray Optics and Optical Instruments Part 2 Questions
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© examsnet.com
Question : 43
Total: 112
A convex lens of refractive index
1.5
and focal length
18
cm
in air is immersed in water. The change in focal length of the lens will be
cm
.
(
.
Given refractive index of water
=
4
3
)
[24-Jan-2023 Shift 2]
Your Answer:
Validate
Solution:
I
f
H
2
O
=
(
µ
g
µ
H
2
O
−
1
)
(
2
R
)
=
1
8
(
2
R
)
=
1
(
4
f
air
)
So,
f
H
2
O
=
4
f
air
=
72
cm
So change in focal length
=
72
−
18
=
54
cm
© examsnet.com
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