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A concave mirror andaconvex lens are hel...

A concave mirror andaconvex lens are held in water. What changes if any, do you expect in their respective focal lengths as compared to their values in air.

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PUNJAB BOARD PREVIOUS YEAR PAPERS-Refraction of Light and Lenses-EXERCISE
  1. Explain the phenomenon of refraction at a plane surface seperating two...

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

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

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

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

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

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

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

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

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  10. What are optical fibres ? Give their one use

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

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

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

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

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

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

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

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

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

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

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