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Three slabs are joined and kept in front...

Three slabs are joined and kept in front of concave mirror of radius of curvature of `150cm`. The entire system is submerged in water `(mu_(` water `=(4)/(3))`.A point object is kept at distance at `20cm` from first slab on the principal axis as shown.The distance of final image formed by this system (from pole of mirror `P` ) is found to be `[150+x)cm`.The value of `x` is `mu_(1)=1.5;mu_(2)=1;;mu_(3)=1.5]`

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