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  1. The angle of a prism is A. One of its refracting surfaces is silvered
  2. Two waves represented by following equations are travelling in same medium
  3. If n₁, n₂ and n₃ are the fundamental frequencies of three segments into which a string
  4. Identify the wrong statement with reference to solar cell
  5. When the wave of hydrogen atom comes from infinity into the first orbit,