$A$ biconvex lens of focal length $f$ and radii of curvature of both surfaces $R$ is made of a material of refractive index $n_{1}$. This lens is placed in a liquid of refractive index $n_{2}$. How will this lens behave?

• A
  Either as a convex or as a concave lens depending solely on $R$
• B
  $A$ convex lens depending on $n_{1}$ and $n_{2}$
• C
  $A$ concave lens depending on $n_{1}$ and $n_{2}$
• D
  $A$ convex lens of same focal length irrespective of $R, n_{1}$ and $n_{2}$