In the theatre, coloured lights are used to make interesting effects. To make coloured light, a filter is placed in front of a bright white light. A filter is a piece of colouredor glass. It only lets through some of the colours which make up white light. It absorbs the other colours. For example, a red filter lets through red light (and a bit of orange). It absorbs yellow, green, blue, indigo and violet.
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In the theatre, coloured lights are used to make interesting effects. To make coloured light, a filter is placed in front of a bright white light. A filter is a piece of colouredor glass. It only lets through some of the colours which make up white light. It absorbs the other colours. For example, a red filter lets through red light (and a bit of orange). It absorbs yellow, green, blue, indigo and violet.
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Light creates heat. For roofs in hot or cold climates what color would be better, black or white?