Which of the following materials causes regular reflection of incident light?

Heap of sugar crystals

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Polished steel plate

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Plane mirror

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Rubber mat

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Solution

The correct option is C Plane mirror
Regular reflection takes place from a smooth reflecting surface e.g a plane mirror or a polished steel plate.
Diffused reflection takes place from the surfaces that are rough or irregular and consequently the reflected light rays scatter in arbitrary directions. In a heap of sugar, all the crystals align themselves in random orientations and therefore, the outer surface is very irregular. Rubber mats are made rough for a better grip, so the light falling on them incur diffused reflection.

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