The unit of power of a lens (P) is |
|||||||

(a) |
cm |
(b) |
mm |
(c) |
diopter |
(d) |
hertz |

The unit of power of a lens (P) is |
|||||||

(a) |
cm |
(b) |
mm |
(c) |
diopter |
(d) |
hertz |

127