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A double convex lens has two surfaces of equal radii R and refractive index m=1.5, we have

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A double convex lens has two surfaces of equal radii R and refractive index m=1.5, we have
A. `f=R/2`
B. `f=R`
C. `f=-R`
D. `f=2R`
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Correct Answer - B
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