An electromagnetic wave of intensity 50Wm^-2 enters in a medium of refractive index 'n' without any loss. The ratio of the magnitudes of electric fields, and the ratio of the magnitudes of magnetic f…

Question

An electromagnetic wave of intensity 50Wm^-2 enters in a medium of refractive index 'n' without any loss. The ratio of the magnitudes of electric fields, and the ratio of the magnitudes of magnetic fields of the wave before and after entering into the medium are respectively, given by:

Accepted Answer

Correct answer: C. (c) JEE Main 2019 The speed of electromagnetic wave in free space is given by C= 1 _0ϵ_0…..(i) In medium, v= 1 k ∈_0 _0 … . . ( ii ) Dividing equation (i ) by ( ii ), we get ∴ CV= k=n 12ϵ_0E_0^2C= intensity = 12ϵ_0 kE^2v ∴E_0^2C= kE^2v ⇒ E_0^2E^2= kVC= n^2n ⇒ E_0E= n Similarly B_0^2C2 _0= B^2v2 _0 ⇒ B_0B= 1 n

$An electromagnetic wave of intensity enters in a medium of refractive index ' without any loss. The ratio of the magnitudes of electric fields, and the ratio of the magnitudes of magnetic fields of the wave before and after entering into the medium are respectively, given by:$

Solution

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