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KEAM 2021 Physics and Chemistry Solved Paper
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© examsnet.com
Question : 22
Total: 120
The apparent depth of a needle lying in a water beaker is found to be
9
c
m
. If water is replaced by a liquid of refractive index
1.5
, then the apparent depth of needle will be
(
mu
of water is
4
3
)
10
c
m
9
c
m
12
c
m
7
c
m
8
c
m
Validate
Solution:
Given, apparent depth
(
d
app
)
water
=
9
c
m
µ
water
=
4
∕
3
µ
liquid
=
1.5
As we know,
d
a
p
p
=
actual depth
refractive index
(
µ
)
⇒
d
a
p
p
∝
1
µ
⇒
(
d
app
)
liquid
(
d
app
)
water
=
µ
water
µ
liquid
Substituting the given values, we get
(
d
app
)
liquid
9
=
4
/
3
1.5
⇒
(
d
app
)
liquid
=
4
×
9
×
2
3
×
3
=
8
c
m
© examsnet.com
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