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it travel in a staight line
The medium through which it is propagating. For exampl if the sound waves are travelling in air they will move slower than those travelling through a wall speed of sound in solids > speed of sound in liquids > speed of sound in gases
The amount light bends when travelling through a medium depends on the medium's refractivity or refractive index.
Light will propage in "a straight line" when passing through a single medium. The "straight line" however bends depending on the gravitation curvature of the volume being passed through.
travels through a uniform medium
Air is the medium (if you are talking about something travelling through it).
it travel in a staight line
The medium through which it is propagating. For exampl if the sound waves are travelling in air they will move slower than those travelling through a wall speed of sound in solids > speed of sound in liquids > speed of sound in gases
The amount light bends when travelling through a medium depends on the medium's refractivity or refractive index.
towards the normal
The velocity of light (and other electromagnetic waves) depends on the medium through which it is travelling.
Travelling through a medium that is optically less dense. Vacuum is best.
Light will propage in "a straight line" when passing through a single medium. The "straight line" however bends depending on the gravitation curvature of the volume being passed through.
away from the normal
travels through a uniform medium
travels through a uniform medium
Any change in the refractive index of the medium through which the light is travelling causes refraction of light.