Physics
In a bipolar junction transistor

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 emitter has the least concentration of impurity
The collector has the least concentration of impurity

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Physics
'Mirage' is an example of

Refraction of light only
Dispersion of light only
Total internal reflection of light only
Refraction and total internal reflection of light

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