^{1/2}, where R is the radius of curvature of the spherical surface and λ is the wavelength. Assume that the air gap is everywhere much less than R and also r<

- 2t=mλ

- R-t=(R

^{2}-r

^{2})

^{1/2}

R-t=R(1-r^{2}/R^{2})^{1/2}

R-t~R(1-r^{2}/(2R^{2}))

R-t=R-r^{2}/2R

- -t=-r

^{2}/2R

t=r^{2}/2R=mλ

r^{2}=mλR

r = (mλR)^{1/2}

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