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Two lenses of powers+15D and -5D are in ...

Two lenses of powers+15D and -5D are in contact with each other. What is the focal length of combination?

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PUNJAB BOARD PREVIOUS YEAR PAPERS-Refraction of Light and Lenses-EXERCISE
  1. An object of size 5 cm is placed at distance of 25 cm in front of a co...

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  2. An object of size 10 cm is placed at distance of 20 cm in front of aco...

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  3. Two lenses of powers+15D and -5D are in contact with each other. What ...

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  4. If the focal length of a converging lens is 50 cm. What is the power o...

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  5. Define refractive index?

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

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  7. What is refraction of light?

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  8. A convex lens made of a material of refractive index mu1 , is kept in ...

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  9. A convex lens made of a material of refractive index 'mu1' is kept in ...

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  10. A convex lens made of a material of refractive index mu1 is kept ih a...

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  11. Define critical angle for total internal reflection.

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  12. Define critical angle for total internal reflection.

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

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  14. Name the type of lens whichalways produces virtual and erect image.

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

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

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

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  18. How will you explain twinkling of stars?

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

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

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