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Byju's Answer
Standard IX
Physics
Refractive Index
The refractiv...
Question
The refractive index of water is 1.33.The speed of light in water is?
A
4
×
10
8
m
/
s
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B
3
×
10
8
m
/
s
.
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C
2.25
×
10
8
m
/
s
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D
1.33
×
10
8
m
/
s
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Solution
The correct option is
C
2.25
×
10
8
m
/
s
Since,
μ
=
c
v
=
s
p
e
e
d
o
f
l
i
g
h
t
i
n
a
i
r
s
p
e
e
d
o
f
l
i
g
h
t
i
n
m
e
d
i
u
m
So,
μ
v
=
c
or
v
=
c
μ
=
3
×
10
8
m
/
s
1.33
=
2.25
×
10
8
m
/
s
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×
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