What do you understand by the statement, "critical angle for water is $48 °$ .

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Solution

Critical angle: Angle of incidence in a denser medium, for which the angle of refraction in the rarer medium is $90 °$ is called critical angle.
The statement the critical angle for water is $48 °$ means if the light in water travels at an angle of incidence equal to $48 °$ it will come out in the air along the surface of the water.

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