A Double-Convex Thin Glass Lens Has Equal-Magnitude Radii of Curvature $+ 31.2 \mathrm {~cm}$

question 29

Multiple Choice

A double-convex thin glass lens has equal-magnitude radii of curvature. The focal length of this lens is $+ 31.2 \mathrm {~cm}$ and the index of refraction of the glass is $1.52$ . The lens is to be replaced with a plano-convex glass lens of the same focal length and thickness. The radius of curvature of the convex surface of the replacement lens is $13.0 \mathrm {~cm}$ . What should be the index of refraction of the glass of the plano-convex lens?

• A) \(1.40\)
• B) \(1.42\)
• C) \(1.38\)
• D) \(1.36\)
• E) \(1.44\)

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