Choose the incorrect statements from the options given below:

(A) If a monochromatic source is replaced by a source of white light in Young's experiment, then interference fringes will be coloured,
(B) If the screen is moved away from the plane of slits, then the angular width of the fringe will not remain the same,
(C) If separation between slits in Young's experiment is halved, the fringe width becomes double,
(D) The fringe width in Young's experiment is Ad/D

Choose the correct answer from the options given below:

(B) and (D) only

The correct answer is Option (2) → (B) and (D) only

(A) Correct — White light produces coloured fringes due to superposition of multiple wavelengths.

(B) Incorrect — Angular fringe width $\theta = \lambda / d$, independent of distance to screen.

(C) Correct — Fringe width $\beta = \lambda D / d$, halving $d$ doubles $\beta$.

(D) Incorrect — Fringe width formula: $\beta = \lambda D / d$, not $Ad/D$.

Incorrect statements: (B), (D)