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

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

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Physics
In a bipolar junction transistor

The emitter has the least concentration of impurity
The base has the least concentration of impurity
All the three regions (the emitter, the base and the collector) have equal concentrations of impurity
The collector has the least concentration of impurity

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