Chapter 12.3, Problem 18R

To determine

To explain: The process used to produce light in a laser.

Answer to Problem 18R

A laser is produced when electrons in atoms in crystals, gases or glasses (specifically) absorb energy and become excited.

Explanation of Solution

Introduction:

Light is a type of wave that carries energy through matter or space. Laser produces a very narrow beam of light that travels over long distances without distribution.

Atoms in laser-tube absorb light from flash-tube and also, emit light of same wavelength. After this, light waves (some not complete) are reflected between $2$ mirrors that cause further more atoms to emit light. This results a narrow and intense light beam, called laser beam.

Conclusion:

Laser produces narrow, intense beams of light.