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Why do we have bring a small object near...

Why do we have bring a small object near the eyes in order to see it clearly.

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CHETANA PUBLICATION-LENSES-Exercise
  1. For the normal human eye, the distance of distinct vision is

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  2. What do you mean by power of accommodation?

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  3. Why do we have bring a small object near the eyes in order to see it c...

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  4. An object is placed at a distance of 15 cm from a convex lens.If the f...

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  5. An object is placed at a distance of 10cm from a convex lens of focal ...

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  6. An object is kept 60 cm from a lens gives a virtual image 20 cm in fro...

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  7. An object 6 cm tall is placed in front of a convex lens at a distance ...

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  8. An object is placed vertically at a distance of 20 cm from a convex le...

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  9. 5 cm high object is placed at a distance of 25 cm from a converging l...

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  10. The focal length of a convex lens is 20 cm.What is the power?

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  11. Doctor has prescribed a lens having power +1.5D. What will be the foca...

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  12. Calculate the focal length of a corrective lens having power+2.5D.

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  13. Three lenses having power 2, 2.5 and 1.7 D are kept touching in a row....

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  14. Define the following: Centre of curvature (C)

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  15. Define the following: Radii of curvature (R)

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  16. Define the following: Principal axis

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  17. Define the following: Optical centre(O)

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  18. Define the following: Principal Focus(F)

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  19. Define the following: Focal length (f)

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  20. Define the following: Convex lens

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