The medium in which speed of light is the same in all directions is called:

Explanation

The correct answer is Homogenous. A homogenous medium has uniform properties throughout, meaning the speed of light remains constant in all directions. This is crucial for applications where predictable light behavior is necessary, such as in optical fibers.The option Non-homogenous is incorrect because variations in the medium's properties lead to changes in the speed of light in different directions.The option Vacuum (previously 'Empty') is not suitable because although light travels uniformly in a vacuum, it is not a 'medium' in the classical sense as understood in physical optics.The option None of these is incorrect because a homogenous medium is a valid answer according to the question's conditions.