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Explain dispersive and non-dispersive me...

Explain dispersive and non-dispersive medium.

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The variation of refractive index with wavelength may be more pronounced in some media than the other. In vacuum of course, the speed of light is independent of wavelength.
Thus, vacuum (or air approximately) is a non dispersive medium in which all colours travel with the same speed.
This also follows from the fact that sunlight reaches us in the form of white light and not as its components. On the other hand, glass is a dispersive medium.
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KUMAR PRAKASHAN-RAY OPTICS AND OPTICAL INSTRUMENTS-SECTION-D (MULTIPLE CHOICE QUESTIONS (MCQs))(MCQs ASKED IN COMPETITIVE EXAMS)
  1. Explain dispersive and non-dispersive medium.

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  2. Which of the following is used in optical fibres ?

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  3. An astronomical telescope has a large aperture to ….. .

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  4. If two mirrors are kept at 60^@ to each other, then the number of imag...

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  5. As shown in figure, a plano-convex lens of focal length 20 cm is silve...

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  6. A light ray is incident perpendicular to one face of a 90^@ prism and ...

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  7. A plano- convex lens of refractive index 1.5 and radius of curvature 3...

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  8. The refractive index of transparent cylindrical rod is (2)/(root3) . A...

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  9. A fish looking up through the water sees the outside world, contained ...

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  10. Two point white dots are 1 mm apart on a black paper. They are viewed ...

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  11. A thin glass (refractive index 1.5) lens has optical power of - 5D in ...

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  12. The refractive index of glass is 1.520 for red light and 1.525 for blu...

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  13. Two lenses of power - 15D and + 5D are in contact with each other. The...

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  14. When monochromatic red light is used instead of blue light in a convex...

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  15. A beaker contains water up to a height h(1) and kerosene of height h(2...

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  16. Diameter of a plano-convex lens is 6 cm and thickness at the centre is...

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  17. A green light is incident from the water to the air-water interface at...

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  18. Monochromatic light is incident on a glass prism of angle A. If the re...

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  19. On a hot summer night, the refractive index of air is smallest near th...

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  20. An observer looks at a distant tree of height 10 m with a telescope of...

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  21. A diverging lens with magnitude of focal length 25 cm is placed at a d...

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