The speed of the ray is slower in the denser material. the denser material encounters more interference (time) to travel the same distance.
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it bends
The refraction of light is the change in direction of a light ray when it crosses a boundary between two transparent substances. Refraction of light is the change in direction of a light ray due to a change in its speed as it goes from one medium to another.The speed and wavelength of a light ray change when this occurs, but the frequency remains the same.When light travels from denser medium to rarer medium it moves away from the normal [line at right angles to the boundary] and when light travels from rarer to denser it moves towards the normal.
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it bends
The refraction of light is the change in direction of a light ray when it crosses a boundary between two transparent substances. Refraction of light is the change in direction of a light ray due to a change in its speed as it goes from one medium to another.The speed and wavelength of a light ray change when this occurs, but the frequency remains the same.When light travels from denser medium to rarer medium it moves away from the normal [line at right angles to the boundary] and when light travels from rarer to denser it moves towards the normal.
when light falls from air on lens it undergoes refraction as lens is denser than air light on entering lens move towards normal and is bent and while leaving moves away from normal
The cold air moves under the warm air because the former is denser. So Warm air is denser.
No. Sound moves faster in a denser medium and the colder the air is the denser it is.
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Warm air is displaced by cooler denser air