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[" 23A circular disc of radius "R" is pl...

[" 23A circular disc of radius "R" is placed co-axially and horizontally inside an "],[" opaque hemispherical bowl of radius a figure.The far edge of the discis "],[" just visible when viewed from the edge of the bowl.The bowl is filled "],[" with transparent liquid of refractive index "mu" and the near edge of the "],[" disc becomes just visible.How far below the top of the bow is the disc "],[" placed? "]

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