MCQOPTIONS
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MCQOPTIONS
| 1. |
If the focal length of the biconvex lens is 25 cm, then the power of the lens will be [NDA] |
| A. | + 4 dioptre |
| B. | - 4 dioptre |
| C. | When speed of motor increases |
| D. | - 0.04 dioptre |
| Answer» B. - 4 dioptre | |