Rays go from fish to eye.

n₁ = 1.33 (water), n₂ = 1.00 (air)

p = (20 - 6) = 14 cm (from surface to fish)

n₁/p ₊ n₂/q = (n₂ -n₁)/r

1.33/14 + 1.00/q = (1.00 - 1.33)/-20

q = -12.7 cm

Therefore the image is virtual and 12.7 cm to the left of the surface or 7.3 cm to the right of centre.

m = y'/y = -(n₁q)/(n₂p) = -1.33(-12.7)/(1.00X14) = +1.21

Image is erect (+) and 21% larger.

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