In Young's double-slit experiment, the wavelength of light was changed from `7000 Å` to 3500 Å`. While doubling the separation between the slits, which of the following is not true for this experiment?

Options

A. The width of fringe changes.
B. The color of bright fringes change.
C. The separation between seccessive bright fringes changes.
D. The separation between successive bright fringes unchanged.

Answer

d

Explanation

Fringe width,` beta = (lambda D)/(d)`
`beta` becomes `(1//4th)` when `lambda` is half and d is doubled. The separation between successive dark fringes reduces. It does not remain unchanged.