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  1. An object is seen through a simple microscope of focal length 12 cm.
  2. A polarised light of intensity I₀ is passed through another polariser whose pass axis
  3. A current I ampere flows along the inner conductor of a co-axial cable and returns
  4. An object is 8 cm high. It is desired to form a real image 4 cm high at 60 cm from
  5. For a cubic crystal structure which one of the following relations