A) 5°
B) 4°
C) 7°
D) 9°
Correct Answer: B
Solution :
The deviation produced by crown prism is \[\delta =(\mu -1)A\]and that by flint glass is \[\delta '=(\mu '-1)A'\]In case of no net deviation\[\delta =\delta '\] \[A'=\left[ \frac{(\mu -1)}{(\mu '-1)} \right]A=\frac{1.517-1}{1.620-1}\times {{5}^{o}}\]\[=4.2\simeq {{4}^{o}}\]You need to login to perform this action.
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