A plane mirror is placed horizontally inside water. A ray falls normally on it. The mirror is
rotated by angle such that after reflection, the ray
does not come out of water. The minimum value of angle rotated is what??
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Answer:
more than the critical angle
Explanation:
the angle is rotated on such a phase that the angle of refraction is more that 90°. This follows the principle of total internal reflection
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It will be more than crital angle...
By the the condition given in example the ray undergoes total internal reflection in which the angle of incidence is more than critical angle
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