Question: At what thickness will a thick convex-concave glass lens in air (a) Serve as a telescope provided the curvature radius of its convex surface is

At what thickness will a thick convex-concave glass lens in air
(a) Serve as a telescope provided the curvature radius of its convex surface is ∆R = 1.5 cm greater than that of its concave surface?
(b) Have the optical power 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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