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Miscellaneous·2012·Easy

Two thin convex lenses of focal lengths 4 cm and 8 cm are separated by a distance of 4 cm in air. The combination will have the focal length

Two thin convex lenses of focal lengths 4 cm and 8 cm are separated by a distance of 4 cm in air. The combination will have the focal length

Options

  1. a.

    4 cm

  2. b.

    8 cm

  3. c.

    12 cm

    Correct answer
  4. d.

    32 cm

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