Physics
A light ray travelling from denser to rarer medium at an angle of incidence more than critical angle of concerned media pair suffers.

Total internal reflection
Diffraction
Reflection
Refraction

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Physics
In a bipolar junction transistor

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

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