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  1. A ray enters a glass sphere of refractive index μ=√3 at an angle of incidence of 60⁰
  2. The escape velocity of a body on an imaginary planet which is thrice the radius
  3. A block of 2 kg is kept on the floor. The coefficient of static friction is 0.4
  4. In an a.c circuit the e.m.f. (e) and the current (i) at any instant are given
  5. An unpolarised beam of intensity I is incident on a pair of nicols making an angle