In Young's double slit experiment the in...

In Young's double slit experiment the interference pattern is found to have an intensity ratio between bright and dark fringes as 9. This implies

the intensities at the screen due to the slits are 5 and 4 units

the intensities at the screen due to the two slits are 4 and 1 units

the amplitude ratio of the individual waves is 3

the amplitude ratio of the individual waves is 2

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