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At what thickness will a thick convex-ca...

At what thickness will a thick convex-cancave glass lens in air
(a) serve as a telescope provided the curvature radius of its convex surface is `DeltaR = 1.5 cm` greater than that of its concave surface?
(b) have the optical equal to `-1.0 D` if the curvature radii of its convex and concave surfaces are equal to `10.0` and `7.5 cm` respectively ?

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