The radii of curvature of the faces of a double convex lens are 10 cm – McqOptions

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1.	The radii of curvature of the faces of a double convex lens are 10 cm and 20 cm. The refractive index of the glass is 1.5. What is the power of this lens (in units of diopter)?
A.	+7.5 D
B.	-7.5 D
C.	+2.5 D
D.	+5.0 D
Answer» B. -7.5 D

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