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A biconvex lens ( R ₁= R ₂=20 ~cm ) has focal length equal to focal length of concave mirror. The radius of curvature of concave mirror is [R.I. of glass lens =1 5 ]

Options

  1. A-40 ~cm
  2. B-20 ~cm
  3. C40 ~cm
  4. D20 ~cm

Correct answer

A. -40 ~cm

Step-by-step solution

array l 1 f =(n-1) ( 1 R₁ - 1 R₂ ) n=1.5, R₁=20 ~cm , R₂=-20 ~cm f=20 ~cm array for a concave mirror, R=2 f and it is negative. R=-40 ~cm

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