Bhavna Singh
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Poll

Principal axis is:

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Poll Results

100%[A] imaginary line joining of two centres of curvature ( 2 voters )
0%[B] centres of two imaginary spheres of which lens is a part
0%[C] centre point of a lens
0%[D] Radii of two imaginary spheres of which the lens is a part
Based On 2 Votes

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