This question has Statement-1 and Statement-2. Of the four choices given after the Statements, choose the one that best describes the two Statements.
Statement-1: Short wave transmission is achieved due to the total internal reflection of the e-m wave from an appropriate height in the ionosphere.
Statement-2: Refractive index of a plasma is independent of the frequency of e-m waves. [Main Online April 22, 2013]
(1) Statement-1 is true, Statement-2 is false.
(2) Statement-1 is false, Statement-2 is true.
(3) Statement-1 is true, Statement-2 is true but Statement -2 is not the correct explanation of statement-1.
(4) Statement-1 is true, Statement-2 is true and Statement -2 is the correct explanation of Statement-1.