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An object of size 10 cm is placed at dis...

An object of size 10 cm is placed at distance of 20 cm in front of aconcave lens of focal length 20 cm. Find the size and nature of image. Also find distance of image from the lens

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PUNJAB BOARD PREVIOUS YEAR PAPERS-Refraction of Light and Lenses-EXERCISE
  1. What is the focal lengthof the combination of a convex lens of focal l...

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  2. An object of size 5 cm is placed at distance of 25 cm in front of a co...

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

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

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

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  6. Define refractive index?

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

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  8. What is refraction of light?

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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 in ...

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

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  12. Define critical angle for total internal reflection.

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  13. Define critical angle for total internal reflection.

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

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

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

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

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

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  19. How will you explain twinkling of stars?

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

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