If the intensities of the two interfering beam in Young's double-slit experiment are `I_(1)` and `I_(2)`, then the constrast between the maximum and minimum intensities are good when

Options

A. `I_(1)` is much greater than `I_(2)`
B. `I_(1)` is much smaller than `I_(2)`
C. `I_(1)=I_(2)`
D. either `I_(1)=0 or I_(2)=0`

Answer

C

Explanation

If `I_(1) =I_(2)` then the amplitudes of waves are equal, the dark fringe. i.,e minima is completely dark and so a good contrast between maxima and minima is botained.