Discussion
Assertion (A): Halogen bulbs must not be touched with bare fingers.
Reason (R): Skin oils create a hot spot that devitrifies the quartz envelope.
Select the correct answer from the options below.
Answer: C
The contaminated spot crystallises at the operating temperature and the envelope cracks, often within hours. The reason therefore explains the instruction precisely, and cleaning a touched bulb with alcohol before fitting rescues it. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Most errors here come from carrying across a result from a neighbouring case where it does not hold.
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