Light of wave–length λ is incident on a slit of width d. The resulting diffraction pattern is observed on a screen placed at a distance D. The linear width of the principal maximum is equal to the width of the slit, then D = __________ .
(A) (d2 / 2λ) (B) (2λ2 / d) (C) (d / λ) (D) (2λ / d)
