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If focal length of human eye is 2 ~cm , then find the focal length of contact lens, such that a combined focus system of focal length 2.5 ~cm is obtained after using contact lens.

Options

  1. A-1 ~cm
  2. B-5 ~cm
  3. C-10 ~cm
  4. D-20 ~cm

Correct answer

C. -10 ~cm

Step-by-step solution

aligned & ( ): P_ net =P_ eye +P_ lens & 1 f_ net = 1 f_ eye + 1 f_ lens & 1 2.5 = 1 2 + 1 f_ lens or f_ lens =-10 ~cm aligned

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