Optics Formulas

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Last updated 12:29 AM on 9/27/25
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6 Terms

1
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What is the curvature (R) formula?

1/r

2
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How to find the power of a front surface of a Lens?

n-1/r1

3
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How to find the power of a back lens surface?

1-n/r2

4
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How to find the spherical equivalent?

SE= sphere + cyl/2

5
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How do you find the adjusted sphere when cutting cyl?

original sph + (cyl cut/2)

6
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How to find the oblique power in a sphere-cyl lens?

Pø=Psph + Pcyl (sin^2 a)