1.

n number of identical equilateralprisms are kept in contact as shown in figure. If deviation through a single prism is delta. Then, (n,m are integers)

Answer»

if `N=2m,` deviation through n prisms is zero
if `n=2m+1,` deviation through system of n prisms is `delta`
if `n=2m,` deviation through system n prisms is `delta`
if `n=2m+1,` deviation through system of n prisms is zero

SOLUTION :For `n=2m,` it is just like slab.

`:. Deviation=0`
For `n=2m+1,` it is just like an identical prism of
LARGER size.


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