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  1. A thin convex lens of refractive index 1.5 has 20 cm focal length in air. If the lens
  2. When the wave of hydrogen atom comes from infinity into the first orbit,
  3. In Young’s double slit experiment the distance between the slits and the screen
  4. Which of the following measurement is most precise?
  5. Two waves are represented by the equations y₁ = a sin (?t + kx + 0.57) m