Please solve attached Question.​

Q.  A circular disc of diameter d lies horizontally inside a metallic hemispherical bowl of radius 'a'. The disc is just visible to an eye looking over the edge. The bowl is now filled with a liquid of refractive index μ . Now, the whole of the disc is just visible to the eye in the same position. Show that  d   =   2 a   μ 2   -   1 μ 2   +   1

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