MCQOPTIONS
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| 1. |
Dioptre power of an concave lens of 10 cm focal length is |
| A. | 10 dioptre |
| B. | 10 dioptre |
| C. | 1 / 10 dioptre |
| D. | 1 / 10 dioptre |
| Answer» C. 1 / 10 dioptre | |