$\frac{\Delta E }{ E } \times 100=\frac{2 \Delta I }{ I } \times 100+\frac{\Delta R }{ R } \times 100+\frac{\Delta T }{ T } \times 100$
$=2 \times 2+1+3=8$
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($A$) It will deflect up by an angle $\tan ^{-1}\left[\frac{\left(n_2^2-n_1^2\right) d}{2 h}\right]$
($B$) It will deflect up by an angle $\tan ^{-1}\left[\frac{\left(n_2-n_1\right) d}{h}\right]$
($C$) It will not deflect.
($D$) The deflection angle depends only on $\left(n_2-n_1\right)$ and not on the individual values of $n_1$ and $n_2$.
