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(i) It has of continuously varying wavelengths in a exact wavelength range.
(ii) It is given by solids, liquids and highly compressed gases heated to high temperature.
(iii) E.g. Light from the sun, candle flame, filament of incandescent bulb etc.
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The helicopter view in fig. p3.29
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(i) It is also known as impure semiconductor. (ii) The phenomena of adding impurity is known as Doping.
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