Difficult
$A$ ray of light is incident on a thick slab of glass of thickness $t$ as shown in the figure. The emergent ray is parallel to the incident ray but displaced sideways by a distance $d$. If the angles are small,then $d$ is
- A$t\left( {1 - \frac{i}{r}} \right)$
- B$rt\left( {1 - \frac{i}{r}} \right)$
- C$it\left( {1 - \frac{r}{i}} \right)$
- D$t\left( {1 - \frac{r}{i}} \right)$
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