A ray of light is incident on a boundary separating a
denser medium (nd = 13) and a rarer medium
(nr = 1). The ray enters rarer medium from the
denser medium at an angle of incidence 30°.
The deviation of the refracted ray relative to the incident
ray is
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The angle of refraction for ray is 90 , Imagine now a ray of light travelling from a denser medium to a rarer medium.For example air and water,where water being denser medium and water being rarer.When this ray strikes the interface,its certain that the ray would undergo refraction. The particular value of angle of incidence that the incident ray makes with the normal such that the angle of refraction becomes 90 degree,that is the refracted ray travels parallel to the interface. this particular value of angle of incidence is called critical angle.
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