What is different between the manner in which movement takes place in a sensitive plant and the movement in our legas?
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Critical Angle. Because n 1 is greater than n 2, there is a certain angle i for which the angle of refraction is 90 °. From the table this special incidence angle, called critical angle, is equal to 65.39 °. Any ray incident at an angle greater than the critical angle will be totally reflected.
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See the above attachment for answer.
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