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If the critical angle for total internal
Question
If the critical angle for total internal reflection from a medium to vacuum is
3
0
o
. Then velocity of light in the medium is:
A
3
×
1
0
8
m
/
s
B
4
.
5
×
1
0
8
m
/
s
C
1
.
5
×
1
0
8
m
/
s
D
2
.
5
×
1
0
8
m
/
s
Medium
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Updated on : 2022-09-05
Solution
Verified by Toppr
Correct option is C)
Critical angle for total internal reflection
θ
c
=
3
0
o
As we know, refractive index of air medium
n
a
i
r
=
1
Refractive index of the medium
n
=
sin
θ
c
1
∴
n
=
sin
3
0
o
1
=
0
.
5
1
⟹
n
=
2
Velocity of light in medium
v
=
n
c
∴
v
=
2
3
×
1
0
8
=
1
.
5
×
1
0
8
m
/
s
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