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  • 05-02-2024
  • Physics
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The radii of curvature of the two surfaces of a lens are 20cm and 30cm and the refractive index of the material of the lens is 1.5. If the lens is concavo-convex then the focal length of the lens is:

A. 24cm
B. 10cm
C. 120cm
D. −120cm

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