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  1. The first line in Lyman series has wavelength λ. The wavelength
  2. The additional energy that should be given to an electron to reduce its de-Broglie
  3. A charged particle (charge q) is moving in a circle of radius R with uniform speed v
  4. In a compound microscope, the focal length of the objective is 2.5 cm and of eye lens
  5. Radii of curvature of a converging lens are in the rato 1:2. Its focal length