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Cool goIITian

Joined:	10 May 2008
Post:	83

13 Oct 2008 22:36:16 IST

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calculate focal length

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Two plano-concave lenses of glass of refractive index 1.5 have radii of curvature of 20 cm and 30 cm.They are placed in contact with curved surfaces towards each other and the space between them is filled with a liquid of refractive index 4/3. Find the focal length of the system.please explain the working..

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