Created by StemPy LabTwo 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.
← AEEE preparation
← In a Young's double-slit experiment, light of wavelength 500 nm falls on slits 1.0 mm apart, with the screen 1.0 m 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 1.25 List-II (Value) I. 0.40 mm II. 0.50 mm III. 1.25 mm IV. 1.5 mmSix statements about wavefronts and interference are given below. (i) Light from two sodium lamps gives a steady interference pattern. (ii) Coherent waves of intensity I₀ each give 4I₀ in phase. (iii) A point source at a lens focus gives plane wavefronts. (iv) A small part of a distant spherical wavefront is nearly plane. (v) A wavefront joins points that oscillate with a phase difference of π. (vi) A reflected plane wave obeys the law of reflection. How many of the statements above are correct? →
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