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  1. A luminous object is seperated from a screen by distance d. A convex lens
  2. A milli ammeter of range 10 mA has a coil of resistance 1 ohm
  3. The order of distance of an electron revolving in an atom from nucleus is
  4. When light of wavelength 300 nm falls on a photoelectric emitter,
  5. The coherence of two light sources means that the light waves emitted have