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Question

(a) Define wavefront. Use Huygens' principle to verify the laws of refraction.
(b) How is linearly polarised light obtained by the process of scattering of light ? Find the Brewster angle for air-glass interface, when the refractive index of glass =1.5.
                               


Solution

(a) Wavefront : A wavefront is a continuous locus of all the particles of a medium which are vibrating in the same phase.
In ΔAAB,
                   sin i=ABAB             ...(i)
In ΔABB,
                   sin r=ABAB             ...(ii)
Dividing equation (i) by (ii), 
                          sin isin r=AB/ABAB/AB  sin isin r=ABAB           =ctvtsin isin r=cv=μ
This is the law of refraction.
(b) When a beam of white light is passed through a medium containing particles whose size is of the order of wavelength of light, then the beam gets scattered. When the scattered light is viewed through an analyser in a direction at the right angle to the direction of incidence, it is found to be plane polarised. This is called polarisation by scattering.
We know that, tanip=μ       tanip=1.5       ip=tan1(1.5)=56.31 
                                 

 

Physics

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