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  1. Eight drops of a liquid of density ρ and each of radius a are falling through air
  2. For a normal eye, the cornea of eye provides a converging power 40 D and the least
  3. A neutron is moving with a velocity u.It collides head on and elastically with an atom
  4. Light of wavelength λ is incident on slit of width d. The resulting diffraction
  5. The de-Broglie wavelength of an electron in the first Bohr orbit is