How the speed of light in vacuum is affected by the change of wavelength of light?

Define the term 'resolving power of a telescope'. How will the resolving power be affected with the increase in wavelength of light used?

What is range of wavelength for visisble light?

A new unit of length is chosen such that the speed of light in vacuum is unity. What is the distance between the Sun and the Earth in terms of the new unit if light takes 8 min and 20 s to cover this distance ?

The velocity of light in vacuum can be changed by changing?

The value of velocity of light in vacuum is: