Let $A'$ be angle of flit glass prism.

Here $A=5^{\circ}$ and $\mu= 1.51$ for crown glass prism

$\delta =( \mu -1)A=(1.51-1) \times 5 =2.55$

Deviation produced by flint glass

$\delta =(\mu'-1)A'= (1.65-1) A'$

$\qquad= 0.65\;A'$

For no deviation $\delta'=\delta $

$0.65 A'= 2.55$

$A'= \large\frac{2.55}{0.65}$

$\qquad= 3.92^{\circ}$

Hence a is the correct answer.

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