Lens-Maker Formula: The figure (which is exaggerated somewhat for clarity) illustrates a thin lens. This lens is made of a material with an index of refraction of 1.48, and has radii of magnitudes 6.0 cm and 4.0 cm. What is the focal length of the lens?
A. +25 m
B. -5.0 cm
C. -4.0 m
D. +5.0 m
E. -25 cm
Answer: E
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