Question

The combined correction for curvature and refraction can be given as _______

a.

C = 14d²/6R

b.

C = 6d²/7R

c.

C = 7d²/2R

d.

C = 6d²/14R

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Answer: (d).C = 6d²/14R

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Q. The combined correction for curvature and refraction can be given as _______

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