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Explain the following with the help of a...

Explain the following with the help of a diagram:
Explain the working of an astronomical telescope using refraction of light.

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CHETANA PUBLICATION-LENSES-Exercise
  1. Explain the following : Presbyopia (Old age hypermetropia)

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  2. Explain the following with the help of a diagram: Compound microsco...

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  3. Explain the following with the help of a diagram: Explain the worki...

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  4. Answer the question based on the following diagrams: Name the defect...

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  5. Answer the question based on the following diagrams: Give two reason...

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  6. Answer the question based on the following diagrams: In which figure...

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  7. Selwyn is 16 yr old and wears a spectacle having a power of +2 D .Answ...

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  8. Vijay is 16 yr old and wears a spectacle having a power of -2 D .Answe...

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  9. Ankit developed an eye defect at the age of 65 yrs and had to wear a l...

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  10. What changes in the position of the candle should be made to obtain a ...

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  11. What is nature of image formed if a concave lens is used instead of a ...

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  12. State any one point of difference between a real and virtual image.

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  13. Label A and B in the diagram.

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  14. Explain the functions of A.

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  15. Name the two lenses A and B

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  16. Farsightedness can be corrected by using lens. A. Convex B. concave ...

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  17. The perception of dim light is concerned with cells. A. rod B. cone ...

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  18. Find the odd word out: Long-sightedness, myopia, short sightedness, ne...

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  19. Object at 2F1: image at 2F2:: object at F1:.

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  20. State whether the following statement are 'True' of False". If false w...

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