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ICSE Class 8 Answered

define principle of reversibility
Asked by nathsantanukumar | 17 Apr, 2018, 07:39: PM
Expert Answer
According to this principle, the path of a light ray is reversible.
In figure, a ray of light AO is incident at an angle i on a plane surface SS' that sepatrates two media 1 and 2.
The light ray is refracted along OB at an angle of refraction r.
 
Now if the refraction takes place from medium 2 to 1, the principle of reversibility requires that the ray of light incident along BO at O,
at angle of incidence r in medium 2 will be refracted only along OA at an angle of refraction i in medum 1 and in no other direction than OA.
Answered by Thiyagarajan K | 18 Apr, 2018, 12:35: PM

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