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The sun is seen a little before it rises...

The sun is seen a little before it rises and for a short while after it sets. Explain, why ?

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PUNJAB BOARD PREVIOUS YEAR PAPERS-Refraction of Light and Lenses-EXERCISE
  1. What is total internal reflection, state the necessary conditions for ...

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

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

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  4. What are optical fibres ? Give their one use

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

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

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

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

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

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  10. Derive the relation:- frac(mu2)(v) - frac(mu1)(u) = frac(mu2 - mu1) (R...

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  11. Derive the relation:- frac(mu2)(v) - frac(mu1)(u) = frac(mu2 - mu1) (R...

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  12. Derive the relation:- frac(mu2)(v) - frac(mu1)(u) = frac(mu2 - mu1) (R...

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

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

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  15. Why does a diamond sparkle?

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  16. Derive Lens formula for[frac(1)(v)-frac(1)(u)= frac(1)(f)] a thin conv...

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  17. Define critical angle for total internal reflection.

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  18. Derive the relation:- frac(mu2)(v) - frac(mu1)(u) = frac(mu2 - mu1) (R...

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  19. Derive Lens formula for[frac(1)(v)-frac(1)(u)= frac(1)(f)] a thin conv...

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  20. Derive the relation:- frac(mu2)(v) - frac(mu1)(u) = frac(mu2 - mu1) (R...

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