n1/p + n2/q = (n2 - n1)/R

1.5/5 + 1/q = (1 - 1.5)/(-5) = 1/10

1/9 = 1/10 - 3/10 = 2/10

9 = -5 cm

The spot appears to be 5 cm below the surface.

Answer is A

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