If the focal length of the objective lens is increased then the magnifying power of:
| 1. | microscope will increase but that of the telescope decrease. |
| 2. | microscope and telescope both will increase. |
| 3. | microscope and telescope both will decrease. |
| 4. | microscope will decrease but that of the telescope will increase. |
To increase the angular magnification of a simple microscope, one should increase:
| 1. | the focal length of the lens | 2. | the power of the lens |
| 3. | the aperture of the lens | 4. | the object size |