Refraction at curved surfaces expression:

$\overline{)\frac{{\mathbf{\eta}}_{\mathbf{2}}}{{\mathbf{s}}_{\mathbf{i}}}{\mathbf{+}}\frac{{\mathbf{\eta}}_{\mathbf{1}}}{{\mathbf{s}}_{\mathbf{o}}}{\mathbf{=}}\frac{{\mathbf{\eta}}_{\mathbf{2}}\mathbf{-}{\mathbf{\eta}}_{\mathbf{1}}}{\mathbf{R}}}$

Take the observer to be in the positive direction.

η_{2} = η_{air} = 1

η_{1} = η_{water} = 1.33

s_{o} = -1.00 mm

r = -(d/2) = -(4.00/2) = -2.00 mm

A tiny insect is trapped 1.0 mm from the center of a spherical dewdrop 4.0 mm in diameter.

As you look straight into the drop, what is the insect's apparent distance from the drop's surface?

Express your answer using two significant figures. Answer is in mm.

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