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Can the value of refractive index of a m...

Can the value of refractive index of a material be less than 1?

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No, since speed of light cannot be greater than `3 xx 10 ^(8) m//s`
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CENGAGE PHYSICS-REFRACTION OF LIGHT -GENERAL EXERCISE
  1. Write the lens formula. Explain the terms.

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  2. Why does light bond on changing medium?

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  3. Can the value of refractive index of a material be less than 1?

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  4. What are the factors that the angle of refraction depends on?

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  5. Explain how Snell's law fails to give the value of refractive index fo...

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  6. What is lateral shift?

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  7. Why do stars twinkle?

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  8. Draw ray diagrams for incident rays at angle of incidence less than cr...

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  9. Explain the process of looming.

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  10. Explain different parts of optical fibers with a neat labeled diagram.

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  11. Explain the working of optical fibers.

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  12. Mention three advantages of optical fibers over metal fibers.

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  13. Explain the relation between angle of incidence and deviation for a pr...

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  14. Mention three ways in which total reflecting prisms are better than mi...

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  15. What are the different types of lenses based on the nature of their su...

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  16. Why are convex and concave lens known as converging and diverging lens...

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  17. Why does a lens have two principal focus?

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  18. A convex lens has a real focus and a concave lens has a virtual focus....

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  19. Draw the ray diagram for an object located at 2F for a convex lens and...

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  20. Draw ray diagram for object located at infinity for a concave lens and...

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