|
What is the focal length of a convex lens having power + 5.0 D? |
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|
(a) |
-10 cm |
(b) |
- 20 cm |
(c) |
+ 10 cm |
(d) |
+ 20 cm |
|
What is the focal length of a convex lens having power + 5.0 D? |
|||||||
|
(a) |
-10 cm |
(b) |
- 20 cm |
(c) |
+ 10 cm |
(d) |
+ 20 cm |