As Objects Are Moved Closer to the Human Eye,the Ciliary

question 6

Multiple Choice

As objects are moved closer to the human eye,the ciliary muscle causes the lens at the front of the eye to become more curved,thereby decreasing the focal length of the lens.The shortest focal length of this lens is typically 2.3 cm.What is the closest one can bring an object to a normal human eye and still have the image of the object projected sharply on the retina,which is 2.5 cm behind the lens?

• A)1.2 cm
• B)13 cm
• C)15 cm
• D)21 cm
• E)29 cm

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