A spherical refracting surface separating air from index 1.523 has a radius of curvature of+100 mm. Find a) the exact and approximate sags and b) powers for a 50-mm chord. Ans.: a) exact: 3.175 mm, +5.230 D, b) approx.: 3.125 mm, +5.314 D.

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2. A spherical refracting surface separating air from index 1.523 has a radius of
curvature of+100 mm. Find a) the exact and approximate sags and b) powers for
a 50-mm chord. Ans.: a) exact: 3.175 mm, +5.230 D, b) approx.: 3.125 mm,
+5.314 D.
Transcribed Image Text:2. A spherical refracting surface separating air from index 1.523 has a radius of curvature of+100 mm. Find a) the exact and approximate sags and b) powers for a 50-mm chord. Ans.: a) exact: 3.175 mm, +5.230 D, b) approx.: 3.125 mm, +5.314 D.
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