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Very interesting query!

Usually it is always possible to retrace the path of light. Suppose a light incident at angle 30 deg in rarer medium ie air it would go with an angle 19.5 deg in a glass medium whose refractive index is 1.5.

Now if light traversing form glass incidents at an angle 19.5 deg then it would go refracted with angle of refraction 30 deg.

If this is true then in case of ray traversing from denser into rarer at an angle of incidence equal to critical angle, the ray would go along the boundary as the angle of refraction becomes 90 deg.

So if we retrace the ray going along the boundary of the two medium then the ray would bend into the denser medium making an angle equal to the value of critical angle with the normal drawn to the boundary line.

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Sound travels through different mediums by creating vibrations that are transmitted through the molecules of the medium. These vibrations cause the molecules to bump into each other, passing the sound energy along. The speed of sound varies depending on the medium, with sound traveling faster through solids than liquids and gases.


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