A Thin Spherical Lens Is Fabricated from Glass with an Index

A thin spherical lens is fabricated from glass with an index of refraction of 1.5.The lens is fabricated so that it bulges outwards in the middle on both sides,and has been ground so that the surfaces are part of a sphere with a radius of 20 cm on one side and a radius of 50 cm on the other.What is the power of this lens in diopters?

A) 1.4 D
B) 1.5 D
C) 1.8 D
D) 3.2 D
E) 3.5 D

Correct Answer:

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