Why is light from a common lamp or candle flame non-polarized?

Light from a common lamp or candle flame is non-polarized because it is emitted from a wide range of directions and angles, resulting in light waves vibrating in multiple planes. This random orientation of light waves means there is no preferred direction of vibration, which is characteristic of unpolarized light. In contrast, polarized light has waves that vibrate predominantly in one direction. The scattering and thermal radiation processes involved in the emission of light from a flame or lamp contribute to this non-polarized nature.