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General
Easy
Question
A certain prism is found to produce a minimum deviation of 
It produces a deviation of 
when the angle of incidence is either 
What is the angle of incidence when it is undergoing minimum deviation?
The correct answer is:
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A ball of mass m is attached to a rigid vertical rod by means of two massless strings with length L. The strings are attached to the rod at points a distance L apart (see Figure). The system is rotating about the axis of the rod, both strings being taut and forming an equilateral triangle. The tension in the upper string is 
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at
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