What is the relationship between intensity and amplitude?

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Intensity is defined as power per unit area, and it is proportional to the square of the amplitude of a wave. In electromagnetic radiation, the intensity is contributed equally by the electric and magnetic fields. The relationship between intensity and amplitude can also be expressed through energy density and wave speed. For fringe formation in wave optics, the size of the light source relative to the distance from the slits must satisfy the condition s/S ≤ λ/d. This ensures coherent light waves can produce distinct interference patterns.
Raghav Gupta
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I think basic definition of intensity is power by area.
How intensity is square of the amplitude?
How intensity is energy density times speed of thing?
How in a radiation of EM wave,
Half of the intensity is provided by elec.field and other by magnetic field?
 
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NCERT example 8.5 right?
 
AdityaDev said:
NCERT example 8.5 right?
Yeah, I got all the answers of that by some searching.
Can you answer this one,
In wave optics
taking size of light source =s and distance from 2 slits S,
How s/S <= λ/d
for the fringe formation to take place?
 
Last edited:
Size of light source??
 
AdityaDev said:
Size of light source??
As in NCERT example 10.4 (d) .
 

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