Each pattern shown below would appear on a screen when monochromatic light first

Question

Each pattern shown below would appear on a screen when monochromatic light first passes through a narrow slit of width o and then strikes a screen. The darkest areas on the page represent the brightest areas on the screen. In which case is the slit illuminated with light of the shortest wavelength? The figures below represent interference fringes in two-slit experiment. The distances from the screen to the slits is the same for each figure, and the planes of the screen and the slits are parallel. Which figure(s) represent(s) slits with the smallest spacing d between the slits? The white spaces represent the interference maxima. a. I. b. II. c. III. d. IV. e. V.

Explanation / Answer

Q1) For narrowed slit the diffraction pattern with vertical bright and dark lights forms. Since the wavelength is also shortest, the separation between them is also small.

Option (e) is correct.

Q2)since the slits separation is small, the separation of the bright and dark are same and the slits are parallel to the screen the interefernce pattern will be parallel to the slits.

Option (d) is correct.

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