A Diverging Lens Is Fabricated from a Piece of Glass

question 56

Multiple Choice

A diverging lens is fabricated from a piece of glass with an index of refraction of 1.5.It is ground such that one surface of the lens is convex and the other surface is concave.The convex surface is part of a sphere with a radius of 45 cm and the concave surface is part of a sphere with a radius of 20 cm.What is the focal length of this lens?

• A)-72 cm
• B)-9.2 cm
• C)-28 cm
• D)-17 cm
• E)-64 cm

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