What is the primary difference between lasers and light-emitting diodes (LEDs)?
A) Laser light is monochromatic and LED light is polychromatic.
B) Light emitted by LEDs has limited coherence and directionality.
C) Laser light can produce heat in biological tissues and LEDs cannot produce heat.
D) LED light is produced by radio waves emitted by supra-luminous diodes.

Question

Quizplus · Accepted Answer

The primary difference between lasers and LEDs is that laser light is coherent and directional, while light emitted by LEDs has limited coherence and directionality. Laser light is also usually monochromatic (one color), whereas LED light can emit multiple colors. LED light is not produced by radio waves emitted by supra-luminous diodes, and both lasers and LEDs can produce heat in biological tissues.

What Is the Primary Difference Between Lasers and Light-Emitting Diodes