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What is a luminous object?
An object that produces its own light. e.g. sun, torch, candle
What is a non-luminous object?
An object that does not produce its own light but reflects light. e.g. moon, book
What is a transparent object?
An object that allows light to pass through completely. e.g. glass, water
What is a translucent object?
An object that allows light to pass through partially. e.g. frosted glass, butter paper
What is an opaque object?
An object that does not allow light to pass through. e.g. wood, metal, stone
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