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| 1. |
The light gathering power of an astronomical telescope depends upon(a) length of tube (b) focal length of objective(c) area of eye-piece (d) area of objective |
| Answer» (d) Because of large objective area more light is gathered. As magnification m = β/α, β= angle subtended at the eye by the final image,α= angle subtended by the object at the lens or eye | |