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प्रश्न
Answer the following question in detail.
What are the different types of dispersions of light? Why do they occur?
संक्षेप में उत्तर
उत्तर
- There are two types of dispersions:
a. Angular dispersion
b. Lateral dispersion - The refractive index of material depends on the frequency of incident light. Hence, for different colours, the refractive index of the material is different.
- For an obliquely incident ray, the angles of refraction are different for each colour and they separate as they travel along different directions resulting in angular dispersion.
- When a polychromatic beam of light is obliquely incident upon a plane parallel transparent slab, emergent beam consists of all component colours separated out.
- In this case, these colours are parallel to each other and are also parallel to their initial direction resulting in lateral dispersion.
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अध्याय 9: Optics - Exercises [पृष्ठ १८६]