Physics
Rainbows are produced when sunlight :

Incident on rain drops hanging in the atmosphere is dispersed after suffering refraction
Incident on rain drops hanging in the atmosphere is dispersed after suffering refraction and internal reflection.
Incident on raindrops hanging in the atmosphere is dispresed after suffering reflection.
None of the given statements is correct.

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Physics
In a bipolar junction transistor

The emitter has the least concentration of impurity
The collector 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

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