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How would you find the focal length of a...

How would you find the focal length of a convex lens rapidly but approximately?

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LAKHMIR SINGH & MANJIT KAUR-REFRACTION OF LIGHT-Exercise
  1. Where must the object be placed for the image formed by a converging l...

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  2. Draw a diagram to show how a converging lens held close to the eye act...

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  3. How would you find the focal length of a convex lens rapidly but appro...

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  4. a) With the help of a labelled diagram explain how a convex lens conve...

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  5. a) With the help of a labelled diagram, explain how a concave lens div...

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  6. Draw ray diagrams to represent the nature, position and relative size ...

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  7. a) An object is placed well outside the principle focus of a convex le...

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  8. a) Explain what is meant by a virtual, magnified image. b) Draw a ra...

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  9. A convex lens a focal length of 10 cm. At which of the following posit...

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  10. Which one of the following materials cannot be used to make a lens ?

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  11. A small bulb is placed at the focal point of a converging lens. When t...

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  12. An illuminated object is placed at a distance of 20 cm from a convergi...

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  13. An object is placed between f and 2f of a convex lens. Which of the fo...

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  14. Given a point source of light, which of the following can produce a pa...

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  15. In order to obtain a real image twice the size of the with a convex le...

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  16. A converging lens is used to produce an image of an object on a screen...

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  17. A convex lens of focal length 8 cm forms a real image of the same size...

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  18. A virtual, erect and magnified image of an object is to be obtained wi...

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  19. A burning candle whose flame is 1.5 cm tall is placed at a certain dis...

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  20. A lens of focal length 12 cm forms an upright image three times the si...

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