Question

what is refractive index for an opaque medium?

Answer 1

There is no Refractive Index for the opaque objects as the opaque objects does not allow the light ray to pass through them.So there won`t be any refraction because an opaque object is clear so light passes trough it. This is completely incorrect. Light does not pass through opaque objects. It is because the vibration of electrons happens so quickly that energy is passed on to other atoms. Thus, the wave is not re-emitted and no refraction occurs.

Answer 2

There is no Refractive Index for the opaque objects as the opaque objects does not allow the light ray to pass through them.So there won`t be any refraction.