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

• A

  either as a convex or as a concave lens depending solely on $\mathrm{R}$
• Correct answer
  B

  a convex lens depending on $n_{1}$ and $n_{2}$
• Correct answer
  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 $n_{2}$

Hence, the correct answer is options: 'B', 'C'.