Question: Hello please answer : A thin convex-concave lens has radii of the convex surface 23.0 cm and of the concave surface 55.0 cm. If the

Hello please answer :

A thin convex-concave lens has radii of the convex surface 23.0 cm and of the concave surface 55.0 cm. If the glass used has an index of refraction of 1.5, what is its focal length? Give the answer in cm.

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