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How will you explain twinkling of stars?...

How will you explain twinkling of stars?

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PUNJAB BOARD PREVIOUS YEAR PAPERS-Refraction of Light and Lenses-EXERCISE
  1. Write the conditions for total internal reflection to takeplace?

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  2. Prove the Relation : "^amub =1/("^bmua)

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  3. How will you explain twinkling of stars?

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  4. State Snell's law of refraction of light.

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  5. When does Snell’s law in refraction fail ?

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  6. Explain the phenomenon of refraction at a plane surface seperating two...

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  7. The sun appears before the sun rise and after sun set for few minutes,...

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  8. A concave mirror andaconvex lens are held in water. What changes if an...

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  9. To a fish under water, the man appears as tall or small standing at th...

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  10. What is total internal reflection of light ? What are essential condit...

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  11. What is total internal reflection, state the necessary conditions for ...

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  12. What is total internal reflection, state the necessary conditions for ...

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  13. Write the conditions for total internal reflection to takeplace?

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  14. The sun is seen a little before it rises and for a short while after i...

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  15. What are optical fibres ? Give their one use

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  16. Derive the relation between refractive index of the medium and critica...

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  17. What are optical fibres ? Explain with the help of diagram on what pri...

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  18. Write the conditions for total internal reflection to takeplace?

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  19. What is total internal reflection of light ? What are the two essentia...

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  20. Write the conditions for total internal reflection to takeplace?

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