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  1. Time taken by light to cross a glass slab of thickness 4 mm and refractive index 3 is
  2. In Young’s experiment, the ratio of maximum to minimum intensities of the fringe
  3. Sodium has body centred packing. Distance between two nearest atoms is 3.7 Å.
  4. A block of 2 kg is kept on the floor. The coefficient of static friction is 0.4
  5. If A=3i+4j and B=7i+24j the vector having the same magnitude as B and parallel to A is