Created by StemPy LabIn a Young's double-slit experiment, light of wavelength falls on slits apart, with the screen away. Match each quantity with its value. List-I (Quantity) A. Fringe width in air B. Distance of the third bright fringe from the centre, in air C. Distance of the third dark fringe from the centre, in air D. Fringe width with the whole set-up in a liquid of index List-II (Value) I. II. III. IV.
← All Quizzes
← Assertion (A): In a single-slit diffraction experiment with monochromatic light, the central bright band on the screen becomes narrower when the slit is made narrower, with the source and the screen left where they were. Reason (R): The first dark band of the pattern lies at an angle θ from the axis given by sinθ = λ/a, where λ is the wavelength of the light and a is the width of the slit.Two statements about interference of light from two narrow slits, lit by the same coherent monochromatic source, are given below.
Statement I: With the screen where it is, moving the two slits closer together makes the fringes on the screen narrower.
Statement II: At the dark fringes the energy of the two waves is destroyed, so the total energy reaching the screen is less than the sum of the two separate beams. →
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