Hale9935 Hale9935
  • 25-01-2024
  • Physics
contestada

Two concave lenses of 60 cm focal length are cemented on either side of a convex lens of 15 cm
focal length. The focal length of the combination is
(A) 10 cm
(B) 20 cm
(C) 30 cm
(D) 40 cm

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