Physics
The magnifying power of an astronomical telescope can be decreased by

Decreasing the focal length of the eyepiece
Increasing the focal length of the objective
None of these
Increasing the focal length of the eyepiece

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Physics
Why are we able to hear short wave broadcasts better than long wave broadcasts ?

By convention, short waves are meant for long distances, whereas long waves are reserved for short distances.
Short waves are unaffected by atmospheric disturbances.
Short waves are more energetic than long waves.
Short wave broadcasts are made by nearby radio stations.

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