The Bending of Light Due to Gravity Maintains the Constancy of the Speed of Light of Vacuum. The Fine Adjustments of Wavelength and Time Period make Wave Propagation Close to the Speed of Light of Vacuum in Other Medium

Matter particles can have variable speed depending on the amount of external force applied on these. Force carrying particles have only one fixed speed in vacuum the speed of light which is the Universal speed limit of the Universe. It means that we cannot accelerate or decelerate the force carrying particles by external force. It implies that every force carrying particle is independent of the influence of other force carrying particles in terms of velocity. But the very speed is a very important property of either matter particles or force carrying particles that relates space with time. Wave propagation of force carrying particle is also independent of gravity too (in terms of acceleration or deceleration of the force carrying particles) as gravity itself is a force resultant of a kind of force carrying particles called gravitons. Under the influence of gravity, the wavelength and frequency deliberately shuffles so that the wave propagation can be close its constant speed at the speed of light in other mediums (like air, water, glass). If we stretch the wave of one period, the straight length of the wave always remains the same for every period disregard of under the influence of gravity (or any other field such as electromagnetic field, Higgs field etc. ) or not with no variation in wavelength and frequency but in the other medium there are variations in the wavelength and the frequency (or time period) of the wave. Due to the variations of wavelength and time period (or frequency), the wave looks bent in other medium. The bent of light due to gravity or other force carrying particles makes straight displacement of light for a given time is less and it looks like as if time runs slow there with respect to the free space.