Identify the INCORRECT statement(s) in the context of phenomenon of interference.
(A) All bright and dark fringes have equal width.
(B) All bright fringes have the same intensity.
(C) Fringe width depends on the distance of screen from the slits.
(D) All dark and bright fringes are not equally spaced.
Choose the correct answer from the options given below.
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → (D) only
In the context of interference:
(A) Correct — In ideal double-slit interference, all bright and dark fringes have equal width.
(B) Correct — Bright fringes have the same maximum intensity.
(C) Correct — Fringe width $\beta = \frac{\lambda L}{d}$ depends on screen distance $L$.
(D) Incorrect — In ideal conditions, bright and dark fringes are equally spaced.
Incorrect statement: (D)