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MHT CET20192 May 2019Morning ShiftPhysicsRay OpticsActual

The equi-convex lens has a focal length ‘ f ’. If the lens is cut along the line perpendicular to principal axis and passing through the pole, what will be the focal length of any half part?

Options

  1. Af 2
  2. B2 f
  3. C3 f 2
  4. Df

Correct answer

B. 2 f

Step-by-step solution

1 f = n - 1 2 R ⇒ 1 f ' = n - 1 1 R ∴ f ' = 2 f

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