Discussion
Assertion (A): Fitting light emitting diode bulbs into a halogen headlamp improves the beam.
Reason (R): A halogen reflector is designed around a filament in a precise position.
Select the correct answer from the options below.
Answer: D
The reason is correct and it is exactly why the assertion is false: a diode source is not where the filament was, so the reflector scatters light and produces glare. The retrofit is usually unlawful as well as ineffective. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb.
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