light source
Học thuậtThân thiện
Definition
Noun: 1. A device that produces illumination: A "light source" is any object or apparatus specifically designed to generate and emit light, making things visible or providing illumination in a space. 2. The origin or point from which light emanates: In a broader physical sense, it is the point or object from which light energy radiates.
Usage
- The term "light source" is a compound noun. It is used to identify the specific origin of light, whether a natural object like the sun or a manufactured device like a lamp.
- It is commonly used in technical, scientific, and everyday contexts to discuss illumination.
Examples
- Noun:
- The sun is our planet's primary natural light source.
- For the photography studio, we need to set up an additional light source to reduce shadows.
- LEDs have become a popular and efficient light source for household lighting.
Advanced Usage
- "Extended light source": In physics and optics, this refers to a source of light that is not a single point but has a measurable size, such as a fluorescent tube or a frosted light bulb, which affects how shadows are formed.
- "Coherent light source": A technical term for a light source, like a laser, that emits light waves with a constant phase difference.
Variants and Related Words
- Lamp (n): A device for giving light, typically using a bulb. (e.g., a desk ).
- Luminaire (n): A technical term for a complete electric light unit, including the fixture and light source.
- Illuminant (n): A formal or technical word for something that provides light.
Synonyms
- Lamp
- Luminaire (technical)
- Illuminant (formal/technical)
Related Phrases
- Point source of light: A light source that is so small it can be considered a single point from a distance, like a distant star or a small LED.
- Diffuse light source: A light source that scatters light softly, minimizing harsh shadows, like a cloudy sky or a lampshade.
Noun
- any device serving as a source of illumination
- he stopped the car and turned off the lights