Q9.23Short answer
A circular disc of radius ‘R’ is placed co-axially and horizontally inside an opaque hemispherical bowl of radius ‘a’ (Fig. 9.5). The d far edge of the disc is just visible when viewed from the edge of the - bowl. The bowl is filled with transparent liquid of refractive index A R C R B µ and the near edge of the disc becomes just visible. How far below the top of the bowl is the disc placed? Fig. 9.5
This question refers to a figure in the original PDF.