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Manipal MET2017PhysicsRay Optics

The plane faces of two identical plano-convex lenses each having a focal length of 50 cm are placed against each other to form a usual biconvex lens. The distance from this lens combination at which an object must be placed to obtain a real, inverted image which has the same size as the object is

Options

  1. A50 cm
  2. B25 cm
  3. C100 cm
  4. D40 cm

Correct answer

A. 50 cm

Step-by-step solution

The focal length of the combination is 1 F = 1 f₁ + 1 f₂ array ll Given, & f₁=50 ~cm , f₂=50 ~cm & 1 F = 1 50 + 1 50 = 2 50 & F= 50 2 =25 ~cm array Object when placed at centre of curvature forms a real, inverted image of same size as object =(2 25=50 ~cm ) .

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