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A scuba diver is 1 meter away from thw window. Where does his image form?

I used n1/d_o + n2/d_i = (n2-n1)/R (this goes to zero since R is infinity), from the Thick Lens Equation.

1.35/100 = -1.65/d_i

d_i = -122.22

Now d_o2 = 152.22, because of the thickness thing (d_i+d_o2 = thickness)

Again;

n/d_o2 + n/d_i2 = (some n - some n)/infinity (goes to zero again)

Which n values do I use? Is it 1.65/152.222 + 1/d_i2 =0

or is it 1.65/152.222+1.35/d_i2 =0 ??