In Young?s double slit experiment, the two slits act as coherent sources of equal amplitude A and wavelengthl. 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 mid-point of the screen in the first case to that in the second case is [IIT-JEE 1986; RPMT 2002]

In Young?s double slit experiment, the two slits act as coherent sourc

1.	In Young?s double slit experiment, the two slits act as coherent sources of equal amplitude A and wavelengthl. 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 mid-point of the screen in the first case to that in the second case is [IIT-JEE 1986; RPMT 2002]
A.	1 : 2
B.	2 : 1
C.	0 : 1 : 2
D.	1 : 1
Answer» C. 0 : 1 : 2

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