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Two lenses of focal length 10 cm; one convex and other concave are placed on the same optic axis at a separation x. A plane mirror is also placed on the same optic axis at a distance of 10 cm from the concave lens. An object O is placed at a distance 30 cm from the convex lens. 30 cm 910 cm- What should be the value of x show that image will coincide with the object ?

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