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Why do stars twinkle?...

Why do stars twinkle?

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Due to atmospheric refraction.
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Assertion : The stars twinkle while the planets do not. Reason : The stars are much bigger in size than the planets.

CENGAGE PHYSICS-REFRACTION OF LIGHT -GENERAL EXERCISE
  1. Explain how Snell's law fails to give the value of refractive index fo...

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  2. What is lateral shift?

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  3. Why do stars twinkle?

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

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  5. Explain the process of looming.

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

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  7. Explain the working of optical fibers.

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

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

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

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

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

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  13. Why does a lens have two principal focus?

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

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

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

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  17. Define centre of curvature of a lens.

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  18. Define radius of curvature of a lens.

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  19. Define principal axis of a lens.

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  20. Define principal focus of a lens.

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