Physics
To prevent damage from lightning, lightning conductors are used on tall structures. The lightning conductor

Should be in the form of a vertical rod
Can be of any shape
Should be made of a good conductor but can be of any shape
Should be made of a good conductor like copper with sharp-pointed edges

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Physics
Energy in reflected light :

Increases with the increase in angle
Does not depends on the angle of incidence
Decreases with the increase in angle of incidence
Becomes maximum for angle of incidence equal to 45°

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