Question

A device for producing intense and coherent (waves in step) beam of light is called a:
A. Laser
B. Maser
C. Search light
D. Radar

Answer 1

Hint:The working principle of the lenser is based on how the photons interact with the atom. There are basically three types of ways to interact with atoms. First one is the absorption of radiation, second one is the spontaneous emission and the third one is the stimulated emission.

Complete step by step answer:
The full form of Laser is Light amplification by stimulated emission of radiation. A laser is generated or created when the electrons from an atom of a special glass, crystals or gases consume electrical energy from an electric current applied on it. The electrons from such atoms move from a lower energy orbit to a higher level of the orbital energy around the nucleus of the atom.
The laser or laser beams plays a very important role in the field of Science & Technology as it has a wide range of applications in the field of medical science, Electrical Engineering, Mechanical Engineering, Civil and Computer Engineering.
A laser is a device which generates light energy from the process of amplification done by an optical body which is based on the stimulated emission of electromagnetic radiation. The process of amplification of light emitted from a body, which allows them to emit a very narrow spectrum or they can emit a single color of light.
The main application of lasers are:-
a) Laser printers.
b) Barcode Scanners.
c) Optical fiber.
d) DNA Sequencing instruments etc.
Hence, a device producing intense and coherent (waves in step) beams of light is called a laser.
Therefore, from the above explanation, the correct option is (A) Laser.

Note:Lasers are classified according to their wavelength in a vacuum. These produce light by itself through an optical oscillator or through an optical amplifier. Laser is also used for skin treatments and surgery.