Question

___ light is light of only one wavelength that travels in one direction with a constant distance between corresponding crests

a. incoherentb. coherentc. incandescentd. compact

Answer 1

b. coherent

Step-by-step explanation:

• The term is taken from its literal meaning that tells "logical and consistent".

• A coherent light is a wave containing only single wavelength and is confined only in one direction while it propagates and does not spreads through.

• Since there is only one wavelength we a single wave pattern and thus there is always a constant distance between the corresponding troughs and crests.

There are two types of coherence:

• Temporal coherence
• Spatial coherence

Temporal coherence means that the position of the two waves is having a constant phase difference at a particular time irrespective of any point in the space where this wave is situated.

Spatial coherence is the constant phase difference at a particular point in the space irrespective of the time.

Answer 2

Coherent light

Step-by-step explanation:

Coherent light is referred to as a beam of light that consists of one wavelength and travels only in one direction. This beam of light has the same frequency. laser light consists of identical waves thus produce coherent light.

Two waves are coherent when they posses the same phase difference between them. for having the same phase difference they should be at the same frequency.