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15. In a two slit experiment with monochromatic light, fringes are obtained on a screen placed at some distance from the slits. If screen is moved by 5 × 10–2 m towards the slits, then change in fringe width is 3 × 10–5 m. If the distance between slits is 10–3 m then wavelength of the light used will be (a) 4000 Å (b) 6000 Å (c) 5890 Å (d) 8000 Å

 15.    In a two slit experiment with monochromatic light, fringes are obtained on a screen placed at some distance from the slits. If screen is moved by 5 × 10–2 m towards the slits, then change in fringe width is 3 × 10–5 m. If the distance between slits is 10–3 m then wavelength of the light used will be     (a) 4000 Å    (b) 6000 Å    (c) 5890 Å        (d) 8000 Å

Grade:8

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