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Standard X
Physics
Refractive Index
Time taken by...
Question
Time taken by light to pass through 4 mm thick glass slab of refractive index 1.5 will be :
A
8
×
10
−
11
s
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B
2
×
10
−
11
s
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C
8
×
10
−
8
s
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D
2
×
10
−
8
s
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Solution
The correct option is
A
2
×
10
−
11
s
We have time taken,
t
=
d
i
s
t
a
n
c
e
t
r
a
v
e
l
l
e
d
s
p
e
e
d
=
t
h
i
c
k
n
e
s
s
o
f
t
h
e
s
l
a
b
c
μ
where,
μ
is the refractive index and
c
is the velocity of light.
Given,
μ
=
1.5
and thickness
=
4
m
m
=
4
×
10
−
3
m
⟹
t
=
4
×
10
−
3
×
1.5
3
×
10
8
=
2
×
10
−
11
s
Suggest Corrections
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