The 4 significant figures of 31,546,000 are all 8 of the digits.
        
             
        
        
        
It is an imaginary transformer which has no core loss, no ohmic resistance and no leakage flux. The ideal transformer has the following important characteristic. The resistance of their primary and secondary winding becomes zero. The core of the ideal transformer has infinite permeability.
 
        
             
        
        
        
-reflection and refraction of light
-dispersion of light
-absorption of light
-polarization of light