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Light is shined into a glass rod. To guarantee the total internal reflection (TIR) happens to all the possible rays, what is the minimum index of refraction n for the glass?
Hint: To make sure all rays TIR inside the rod, you just need to consider an extreme case, i.e., the incident angle q1 (on the top surface of glass rod) equals to 90o.
when the body is uniform motion
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.how can we prove that sn=u+a(1/2)
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two charge(q) each are kept 1m apart, where should third charge be placed in order to get third charge -q/4
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