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Ray Optics and Optical Instruments — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsRay Optics and Optical Instruments1 Mark
MCQ

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

  • A
    Have dispersion without average deviation.
  • B
    Have deviation without dispersion.
  • C
    Have both dispersion and average deviation.
  • D
    Have neither dispersion nor average deviation.
✓

Answer

  1. ​​​​​​Have dispersion without average deviation.
  2. Have deviation without dispersion.
  3. 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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