# Apparent Depth

A circular disc of diameter 'd' lies horizontally inside a metallic hemispherical bowl of radius 'a' . The right edge of the disc is just visible to an eye looking over the edge.The bowl is now filled with a liquid of refractive index ' n '. Now,the whole of the disc is just visible to the eye in the same position <i.e.the left edge is now also visible>.

If $$d = 6 m , a = 5 m$$ what is the value of refractive index ' n ' ?

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