Which of the following statements are true?A. | vedclass

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(D) $1$. The speed of light in a vacuum is a universal constant $(c \approx 3 	imes 10^8 \ m/s)$ and is independent of the direction of propagation,h

Vedclass · Accepted Answer

$C$ and $D$ only

Vedclass · Answer

(D) $1$. The speed of light in a vacuum is a universal constant $(c \approx 3 	imes 10^8 \ m/s)$ and is independent of the direction of propagation,hence statement $A$ is false.$2$. The speed of light in a medium depends on the refractive index,which varies with the wavelength of light (phenomenon of dispersion),hence statement $B$ is false.$3$. According to the postulates of special relativity,the speed of light is independent of the motion of the source,hence statement $C$ is true.$4$. The speed of light in a medium is determined by the properties of the medium (permittivity and permeability) and is independent of the intensity of the light,hence statement $D$ is true.$5$. Therefore,statements $C$ and $D$ are correct.

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