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Old Oct 17th 2009, 12:01 PM   #1
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Exclamation Refractive idex of a liquid in a complex situation

An equiconvex lens, of refractive index 1.5, is in contact with a liquid layer on top of a plane mirror. A small needle with its tip on the principal axis is moved along the axis until its inverted image is found at the position of the needle. The distance of the needle image from the lens is measured 45cm. The liquid is removed and the distance is meas30cm. What is the refractive index f he liquid?
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Old Oct 18th 2009, 12:39 AM   #2
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Please post your attempt at solving this.
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