The light gathering power of an astronomical telescope depends upon
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
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(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
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