A light wave is incident normally on a glass slab of reflected and the amplitude of the electrons field of the incident light is 30V/m, then the amplitude of the eletric field for the wave propogating in the glass medium will be :

Explanation

As 4% of light gets reflected so only `(100-4=96%)` of light comes after refraction so
`P_("refracted")=96/100P_(I)`
`impliesK_(2)A_(t)^(2)=96/100K_(1)A_(i)^(2)`
`impliesr_(2)A_(t)^(2)=96/100r_(1)A_(i)^(2)`
`impliesA_(t)^(2)=96/100xx1/(3/2)xx(30)^(2)`
`A_(t)sqrt(64/100xx(30)^(2))=24`