question_answer

A light wave is incident normally on a glass slab of refractive index 1.5. If 4% of light gets reflected and the amplitude of the electric field of the incident light is \[30V\,{{m}^{-1}},\]then the amplitude of the electric field for the wave propagating in the glass medium will be-                                           [JEE Main 12-Jan-2019 Morning]

A) \[24V\,{{m}^{-1}}\]

B) \[10V\,{{m}^{-1}}\]

C) \[30V\,{{m}^{-1}}\]

D) \[6V\,{{m}^{-1}}\]

Correct Answer: A

Solution :

[a]  and be the perpendicular components of the electric field for transmitted and incident waves respectively.