ICSE Class 10 Answered
why does the speed increase or decrease in a medium i.e what are the factors that affect the speed of light in a medium and how?
Asked by asmithasrushti | 21 May, 2022, 06:56: PM
Expert Answer
Maxwell has found out velocity v of electromagnetic radiation as
..........................(1)
where μ is magnetic permeability of medium and ε is electric permittivity of medium
For a transparent medium , μ = μr μo and ε = εr εo
where μr is relative permeabilty of medium, μo is permeability of free space ,
εr is relative permittivity or dielectric constant and εo is permittivity of free space.
Hence we can rewrite eqn.(1) as
......................... (2)
Let us consider velocity of light c in free space as
................................. (3)
hence velocity of light in a medium can be written using eqn.(2) and eqn.(3) as
Hence factors affecting speed of light in amedium are relative permeability and relative permittivity
Answered by Thiyagarajan K | 21 May, 2022, 10:58: PM
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