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  1. To demonstrate the phenomenon of interference, we require two sources which emit
  2. The magnifying power of a telescope is 9. When it is adjusted for parallel rays
  3. The parallel beams of monochromatic light of wavelength 4.5 x10⁻⁷ m passes through
  4. The liquid-crystal phase of a matter is called
  5. A body of mass 2 kg is moved by a force F=3x where x is the distance covered.