New focal length and power when one surface of an equiconvex lens is ground plane

1. A.
   $\frac{2}{3}f,\ \frac{2}{3}P$
2. B.
   $\sqrt{\frac{2}{f}},\ \sqrt{\frac{P}{2}}$
3. C.
   $\frac{f}{2},\ 2P$
4. D.
   $2f,\ \frac{P}{2}$

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1. A.
   $\dfrac{f}{2}$ and $2P$
2. B.
   $\sqrt{2}f$ and $\dfrac{P}{\sqrt{2}}$
3. C.
   $2f$ and $\dfrac{P}{2}$
4. D.
   $f$ and $P$

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