Is It possible to reduce the speed of light?

Yes it is possible and scientists have already slowed light quite effectively. It's the medium's permittivity on which speed depends on. If you say slowing the light in vacume then may be it is not possible till we can't find a way to manipulate space frequently. read more

If by speed of light you mean speed of the light, then yes there is a way to alter the speed at which light moves. Light’s speed can change from many different factors, though all the factors I’m aware of only lead to a decrease, not an increase beyond its maximum speed which is 300,000 km/s. read more

A team of Scottish scientists has made light travel slower than the speed of light. They sent photons - individual particles of light - through a special mask. It changed the photons' shape - and slowed them to less than light speed. read more

This came to me as a question from one of my friend while I was convinced that the answer is NO. read more