In Young’s double slit experiment, the two slits act as coherent sources of equal amplitude A and wavelength l. In another experiment with the same set up the two slits are of equal amplitude A and wavelength l but are incoherent. The ratio of the intensity of light at the midpoint of the screen in the first case to case to that in the second case is:
1 : 2
2 : 1
4 : 1
1 : 1
Maximum amplitude & Intensity -
When
- wherein
Interference occur only in case of coherent source
In case of incoherent source there is no interference and hence intensity at point is 2 i.
Ratio = 2:1
Option 1)
1 : 2
Incorrect
Option 2)
2 : 1
Correct
Option 3)
4 : 1
Incorrect
Option 4)
1 : 1
Incorrect