A planoconvex lens, when silvered at its plane surface is equivalen...

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A planoconvex lens, when silvered at its plane surface is equivalent to a concave mirror of focal length \( 28 \mathrm{~cm} \). When its curved surface is silvered and the plane surface not silvered, it is equivalent to a concave
P mirror of focal length \( 10 \mathrm{~cm} \), then the refractive index of the material of the lens is :
(A) \( 9 / 14 \)
(B) \( 14 / 9 \)
(C) \( 17 / 9 \)
(D) none
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