|
The power of a lens is + 2.0 D. Its focal length would be |
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|
(a) |
100 cm |
(b) |
50 cm |
(c) |
25 cm |
(d) |
40 cm |
|
The power of a lens is + 2.0 D. Its focal length would be |
|||||||
|
(a) |
100 cm |
(b) |
50 cm |
(c) |
25 cm |
(d) |
40 cm |