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  1. An astronomical telescope arranged for normal adjustment has a magnification of 6.
  2. When light of wavelength 300 nm falls on a photoelectric emitter,
  3. The numebr 0 (zero) is required for
  4. The coefficient of performance of a Carnot refrigerator working between 30⁰C and 0⁰C is
  5. The resistances of the four arms P,Q,R and S in a Wheatstone’s bridge