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JEE Main Physics Class 12 Wave Optics Part 1 Questions
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Question : 85
Total: 100
In a Young's double slit experiment, the two slits act as coherent sources of wave of equal amplitude
A
and wavelength
λ
. In another experiment with the same arrangement the two slits are made to act as incoherent sources of waves of same amplitude and wavelength. If the intensity at the middle point of the screen in the first case is
I
1
and in the second case is
I
2
,
then the ratio
I
1
I
2
is
[2011 RS]
2
1
0.5
4
Validate
Solution:
For coherent sources, intensity at mid point
I
1
∝
(
a
+
a
)
2
⇒
I
1
∝
(
2
a
)
2
For incoherent sources, intensity of mid point is
I
2
∝
2
a
2
∴
I
1
I
2
=
2
1
© examsnet.com
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