Mirage occurs due to refraction of light through air layers of different temperatures (densities) and total internal reflection when ray tries to go from denser to rarer medium at grazing incidence. It's an optical illusion, not real water.
Explanation:
Fuse needs low melting point to melt at overload, high resistance to generate more heat (I²R). Tin-lead alloy suitable. Copper high melting point, not fuse material.
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