Statement I: Velocity of light is constant in all media. Statement II: Light is an electromagnetic wave which has constant velocity in all media.

Question

Statement I: Velocity of light is constant in all media. Statement II: Light is an electromagnetic wave which has constant velocity in all media. (A) If both statements are true and statement II is the correct explanation of statement I. (B) If both statements are true but statement II is not the correct explanation of statement I. (C) If statement I is true but statement II is false. (D) If both statements are false.

Tardigrade Admin · Accepted Answer

In vacuum, velocity of all the components of light is same which is

c

.
Now, in medium, velocity of light is given as

v = c / (ε_{r} μ_{r})^{1/2}

So, as the medium changes (or medium's permeability and permittivity changes), the velocity changes.

Q. Statement I: Velocity of light is constant in all media. Statement II: Light is an electromagnetic wave which has constant velocity in all media.

If both statements are true and statement II is the correct explanation of statement I.

If both statements are true but statement II is not the correct explanation of statement I.

If statement I is true but statement II is false.

If both statements are false.

In vacuum, velocity of all the components of light is same which is c. Now, in medium, velocity of light is given as v=c/(εr​μr​)1/2 So, as the medium changes (or medium's permeability and permittivity changes), the velocity changes.

Q. Statement I: Velocity of light is constant in all media.
Statement II: Light is an electromagnetic wave which has constant velocity in all media.

In vacuum, velocity of all the components of light is same which is $c$ .
Now, in medium, velocity of light is given as
$v = c / (ε_{r} μ_{r})^{1/2}$
So, as the medium changes (or medium's permeability and permittivity changes), the velocity changes.