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  1. A point source is kept at a distnace 1000m has an illumination I. To change the illumination
  2. The interferance pattern is obtained with two coherent light sources of intensity
  3. Two thin lenses of focal lengths f₁ and f₂ are in contact and coaxial.
  4. A radioactive substance has a half-life of four months. Three-fourth of substance
  5. A parallel plate capacitor has 91 plates, all are identical and arranged with same