Diffraction and interference are closely related phenomena that occur together PYQ 2024 CBSE PHYSICS

Diffraction and interference are closely related phenomena that occur together. Diffraction is the phenomenon of bending of light around the edges of the obstacle, while interference is the combination of waves that results in a new wave pattern. In order to get interference, there must be at least two waves that are diffracting. So while diffraction can occur without interference, interference cannot occur without diffraction.

Two slits of width 2 um each in an opaque material are separated by a distance of 6 µm. Monochromatic light of wavelength 450 nm is incident normally on the slits. One finds a combined interference and diffraction pattern on the screen.

(i) The number of peaks of the interference fringes formed within the central peak of the envelope of the diffraction pattern will be :

(A) 2

(B) 3

(C) 4

(D) 6

(ii) The number of peaks of the interference formed if the slit width is doubled while keeping the distance between the slits same will be :

(A) 1

(B) 2

(C) 3

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