|
Focal length of a convex lens is +40 cm. The power of this lens will be |
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|
(a) |
+ 4 dioptre |
(b) |
+2.5 dioptre |
(c) |
+40 dioptre |
(d) |
+25 dioptre |
|
Focal length of a convex lens is +40 cm. The power of this lens will be |
|||||||
|
(a) |
+ 4 dioptre |
(b) |
+2.5 dioptre |
(c) |
+40 dioptre |
(d) |
+25 dioptre |