Question

why aluminium is used to make car headlight reflectors
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Answer 1

Answer:

it's highly corrosion resistant (in most environments) because it forms a thin, stable oxide layer: Aluminium Corrosion Resistance - Aluminium Design. It's cheap compared to solid metal alternatives: chrome, stainless steel, silver, etc. It is relatively ductile, machinable, with a relatively low melting point.

Explanation: