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a. Luminous sources- objects that produces their own light, for example the sun, stars, burning candles,
wood or charcoal fire, electric light bulb, television screens, and glowing worms.
b. Non-luminous –object that do not produce light of their own for example- moon, planets, plants, people,
books, walls, clothes, and wall charts.
joseph rimiru answered the question on October 30, 2017 at 17:40
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