For a normal eye, the far point is at infinity and the near point of distinct vision is about 25 cm in front of the eye. The cornea of the eye provides a converging power of about 40 diepter and the least converging power of eye lens behind the cornea is about 20 dioptre. From this rough data, estimate the range of accommodation of normal eye .

Question

$\begin{array}{1 1} 20\;to\;24\; D \\ 25\;to\;30\; D \\ 15\;to\;20\; D \\ 20\;to\;30\; D \end{array} $