The magnifying power of an astronomical telescope is 10 and the focal length of its eye-piece is 20 cm. The focal length of its object will be |
|||||||

a) |
200 cm |
b) |
2 cm |
c) |
0.5 cm |
d) |
0.5cm |

The magnifying power of an astronomical telescope is 10 and the focal length of its eye-piece is 20 cm. The focal length of its object will be |
|||||||

a) |
200 cm |
b) |
2 cm |
c) |
0.5 cm |
d) |
0.5cm |

127