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Question
Physics
In Young’s double slit experiment the slits are separated by 0.28 mm and the screen is placed 1.4 m away. The distance between the central and fourth bright fringe is measured to be 1.2 cm. The wavelength of light used in the experiment is
Q. In Young’s double slit experiment the slits are separated by
0.28
mm
and the screen is placed
1.4
m
away. The distance between the central and fourth bright fringe is measured to be
1.2
c
m
. The wavelength of light used in the experiment is
5954
234
Wave Optics
Report Error
A
6
×
1
0
−
7
m
85%
B
3
×
1
0
−
7
m
6%
C
1.5
×
1
0
−
7
m
7%
D
5
×
1
0
−
6
m
2%
Solution:
For constructive interference,
x
=
nλ
d
D
Here,
n
=
4
,
d
=
0.28
×
1
0
−
3
m
and
D
=
1.4
m
∴
λ
=
n
D
x
d
=
4
×
1.4
1.2
×
1
0
−
2
×
0.28
×
1
0
−
3
=
6
×
1
0
−
7
m