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

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

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Physics
Specific gravity is defined as the ratio of

Density of water at 4°C to the density of the substance
Density of the substance to the density of water at 0°C
Density of the substance to the density of water
Density of the substance to the density of water at 4°C

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