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

Options

A. `( sqrt( 2) , ( 1)/(sqrt(n))) `
B. `( sqrt( n ) , sqrt( n))`
C. `((1)/(sqrt(n)),(1)/(sqrt(n)))`
D. `((1)/(sqrt(n)),sqrt(n))`

Explanation

The intensity of the wave remain unchanged
So, `(B^(2))/( mu_(0))c = (B_(1)^(2)) /( mu ) v rArr ( B_(1))/(B) = sqrt(n) rArr (B)/( B_(1)) = (1)/(sqrt( n ))`
Also, `( E )/( B ) =c ` and `( E_(1))/(B_(1)) =v rArr (E)/(E_(1))(B_(1))/(B) = (c )/( v) = n rArr (E)/( E_(1)) = ( n )/( sqrt(n)) = sqrt(n)`