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Most Important Selected Qs for JEE AdvancedPhysicsRay Optics

A particle moves towards a concave mirror of focal length 30 cm along its axis and with a constant speed of 4 ~cm / sec . At the instant the particle is 90 cm from the pole

Options

  1. Avelocity of image is 1 ~cm / sec
  2. Bvelocity of image w.r.t. particle is 5 ~cm / sec
  3. Cparticle and image move towards each other
  4. Das the particle approaches pole, velocity of image increases

Correct answer

D. as the particle approaches pole, velocity of image increases

Step-by-step solution

aligned & 1 v + 1 -90 = 1 -30 & 1 v = 1 90 + 1 30 = 1-3 90 =- 2 90 v =-45 ~cm & dv dt =- v ^2 u ^2 du dt =- 45^2 90^2 4=-1 ~m / s aligned

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