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प्रश्न
Critical angle of water is 48°. What do you understand by the statement?
लघु उत्तर
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उत्तर
It means that when a ray travels from water towards air and strikes the water–air boundary at an angle of incidence of 48° in water, the refracted ray travels along the surface (the angle of refraction is 90°). Thus, 48° is the critical angle for water. If the angle of incidence is greater than 48°, total internal reflection occurs.
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