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NEET-XII-Physics

17: Light Waves

with Solutions - page 3
Qstn# iii-9 Prvs-QstnNext-Qstn
  • #9
    A Young’s double slit experiment is performed with white light.
    (a) The central fringe will be white.
    (b) There will not be a completely dark fringe.
    (c) The fringe next to the central will be red.
    (d) The fringe next to the central will be violet.
    digAnsr:   a,b,d
    Ans : (a) The central fringe will be white.
    (b) There will not be a completely dark fringe.
    (d) The fringe next to the central will be violet.
    The superposition of all the colours at the central maxima gives the central band a white colour. As we go from the centre to corner, the fringe colour goes from violet to red. There will not be a completely dark fringe, as complete destructive interference does not take place.
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