By properly combining two prisms made of different materials, it … - Vidyadip

Question

By properly combining two prisms made of different materials, it is possible to:

Have dispersion without average deviation.
Have deviation without dispersion.
Have both dispersion and average deviation.
Have neither dispersion nor average deviation.

✓

Answer

Have dispersion without average deviation.
Have deviation without dispersion.
Have both dispersion and average deviation.

Explanation:
Consider the case of prisms combined such that the refractive angles are reversed w.r.t. each other. Then, the net deviation of the yellow ray will be,
$\delta_\text{y}=(\mu_\text{y}-1)\text{A}-(\mu_\text{y}'-1)\text{A}'$
And, the net angular dispersion will be
$\delta_\text{y}-\delta_\text{r}=(\mu_\text{y}-1)\text{A}(\omega-\omega')$
Thus, by choosing appropriate conditions, we can have the above mentioned cases.

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