\( n \) number of identical equilateral prisms are kept in contact as shown in figure. If deviat...

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\( n \) number of identical equilateral prisms are kept in contact as shown in figure. If deviation through a single prism is \( \delta \). Then, \( (n, m \) are integers)
(a) if \( n=2 m \), deviation through \( n \) prisms is zero
(b) if \( n=2 m+1 \), deviation through system of \( n \) prisms is \( \delta \)
(c) if \( n=2 m \), deviation through system of \( n \) prisms is \( \delta \)
(d) if \( n=2 m+1 \), deviation through system of \( n \) prisms is zero
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