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BITSAT 2017 Slot 2 Solved Paper
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© examsnet.com
Question : 8
Total: 150
In Young's double slit experiment, the slits are
2
m
m
apart and are illuminated by photons of two wavelengths
λ
1
=
12000
Å
and
λ
2
=
10000
Å
. At what minimum distance from the common central bright fringe on the screen
2
m
from the slit will a bright fringe from one interference pattern coincide with a bright fringe from the other?
8 mm
6 mm
4 mm
3 mm
Validate
Solution:
Given,
λ
1
=
12000
Å
and
λ
2
=
10000
Å
D
=
2
c
m
d
=
2
m
m
=
2
×
10
−
3
m
We have,
λ
1
λ
2
=
n
2
n
1
=
12000
10000
=
6
5
as
X
=
n
1
λ
1
D
d
(
n
1
=
5
)
=
5
×
12000
×
10
−
10
×
2
2
×
10
−
3
=
5
×
1.2
×
10
4
×
10
−
10
×
10
3
=
6
m
m
© examsnet.com
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