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JEE Main20244 Apr 2024Morning ShiftPhysicsRay OpticsActual

An effective power of a combination of 5 identical convex lenses which are kept in contact along the principal axis is 25 D . Focal length of each of the convex lens is :

Options

  1. A20 ~cm
  2. B50 ~cm
  3. C500 ~cm
  4. D25 ~cm

Correct answer

A. 20 ~cm

Step-by-step solution

We know that P_ eq = P _ i given all lenses are identical aligned & 5 P=25 D & P=5 D & 1 f =5 f= 1 5 ~m =20 ~cm aligned Hence option (1)

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