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  1. A small angled prism of refractive index 1.4 is combined with another small angled prism
  2. Acceleration of a particle, executing SHM, at its mean position is
  3. A uniform plank of Young’s modulus Y is moved over a smooth horizontal surface
  4. The work function of sodium is 2.3 eV. The threshold wavelength of sodium will be
  5. In a laser tube, all the photons