light unit

ریشه

The word 'light' comes from Middle English 'light', from Old English 'lēoht', from Proto-Germanic 'leuhtaz'. The word 'unit' comes from Latin 'unitas', from 'unus' meaning 'one'.

مثال

• The light unit used to measure the brightness of a light bulb is called a lumen.
• Photographers use light units to determine the correct exposure for a photograph.
• The light unit lux is used to measure the intensity of light falling on a surface.