Question

18. The velocity of electromagnetic waves in a
dielectric medium (refractive index u = 4) is
(1) 3 x 108 metre/second
(2) 1.5 x 108 metre/second
(3) 6 x 108 metre/second
(4) 7.5 x 107 metre/second

Answer 1

Answer:

1

Explanation:

it is not exact velocity of light it is slightly less than that of given in answer.even scientists does not not have idea regarding exact speed of light

Answer 2

Answer:

Velocity of medium = Velocity in air/refractive index

here,

Vmed= 3×10⁸/4 = 7.5×10⁷ m/s