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  1. A thin film of soap solution (n=1.4) lies on the top of a glass plate (n=1.5).
  2. The energy band gap is maximum in
  3. A parallel beam of fast moving electrons is incident normally on a narrow slit.
  4. In a compound microscope, the focal length of the objective is 2.5 cm and of eye lens
  5. If the force exerted by an electric dipole on a charge q at a distance of 1 m is F