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  1. A concave mirror of focal length f₁ is placed at a distance d from a convex lens
  2. Resistances n, each r Ω, when connected in parallel give an equivalent resistance
  3. The ionisation potential of hydrogen-atom is -13.6 eV. An electron in the groundstate
  4. The device can act as a complete electronic circuit is
  5. A bullet emerges from a barrel of length 1.2 m with a speed of 640 ms⁻¹.