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A plano convex lens of refractive index ...

A plano convex lens of refractive index `mu_(1)` and focal length `f_(1)` is kept in contact with another plano concave lens of refractive index `mu_(2)` and focal length `f_(2)`. If the radius of curvature of their spherical faces is R each and `f_(1)=2f_(2)`, then `mu_(1)` and `mu_(2)` are related as :

A

`mu_(1)+mu_(2)=3`

B

`2mu_(1)-mu_(2)=1`

C

`3mu_(2)-2mu_(1)=1`

D

`2mu_(2)-mu_(1)=1`

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