Question

Due to of laser, large energy can be concentrated into an extremely small Bandwidth.
(a) High monochromatic nature
(b) Low monochromatic nature
(c) High resolution
(d) Low resolution

Answer 1

Hint:The Lasers emit light that are of a particular color.This means all the light waves emitted by a laser have equal wavelengths. These waves are coherent which means these waves are in phase in space and time.

Complete step by step solution:
We know that a source is said to be monochromatic in nature if it emits light of only one frequency.
As there is only one frequency emitted in the spectrum of light, they have only a single colour.
In the case of Laser, the light must be necessarily monochromatic, coherent and unidirectional.
A source is said to be coherent, if all the photons present have the same frequency.
In the case of lasers, all the waves are identical, and are in phase with each other, this leads to its coherent beam of light.
Unidirectional means that the light moves in a straight line only in a single direction.
These three factors enable Laser to deposit high amounts of energy even at low bandwidth.
In this case, Bandwidth refers to the width of the optical spectrum of the output. In other words, it states a range of frequency over which the optical element can be adjusted.
Lasers must always be monochrome, this enables them to have a specific electronic transition within a defined energy gap.

Therefore, option A is correct.

Note:Laser is an acronym which expands to Light Amplification by Stimulated Emission of Radiation.
Coherent sources must always have the same frequency as well as the same phase, however, monochromes must have the same frequency only. Therefore, a coherent source is always monochromatic, but the reverse is not always true.