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A convex lens focusses ab object 10 cm f...

A convex lens focusses ab object 10 cm from it on a screen paced 10 cm away from it. A goes plate `(mu=1.5)` of thickenss 1.5 cm is inserted between tehlens and the screen. Where should the object be placed so that its image is again focussed on the screen?

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