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What is astigmatism?...

What is astigmatism?

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Astigmatism: An eye defect by which a person can not focus on horizontal and vertical sides simultaneously is known as astigmatism.
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BETTER CHOICE PUBLICATION-REFRACTION OF LIGHT-NUMERICAL PROBLEMS
  1. What is astigmatism?

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  2. A convex lens of refractive index 1.5 has a focal length of 18 cm in a...

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  3. The radii of curvature of a convex lens are 20 cm and 30 cm nd the re...

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  4. A glass (mu=1.5) convex lens of focl length 40 cm is placed in water (...

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  5. A convex lens of foal length 30 cm and a concave lens of focal length ...

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  6. A small black dot is made on the surface of a glass sphere (mu=1.5) an...

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  7. Two lenses of powers +4 D and -14 D form a combination.If a 2 cm size ...

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  8. A spherical refrativng suurface of denser medium (mu=1.5) is placed in...

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  9. A convex lens of power 4 D is combined with a other lens. For an objec...

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  10. A equiconvex lens of focal length 30 cm is divided into two equal halv...

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  11. A equiconvex lens of focal length 30 cm is divided into two equal halv...

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  12. A double convex lens of focal length 25 cm is divided into two equal h...

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  13. A 5.0 cm long needle is placed vertically at a distance 20 cm in front...

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  14. A 5.0 cm long needle is placed vertically at a distance 20 cm in front...

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  15. A 5.0 cm long needle is placed vertically at a distance 20 cm in front...

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  16. A ray of light of frequency of 5 xx 10^(14)Hz is passed through a liqu...

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  17. A ray of monochromatic light travelling in vacuum with speed c ,wavele...

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  18. For the same angle of incidence,the angles of refraction in three diff...

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  19. Two lenses, one diverging of power 2D and the other converging of powe...

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  20. The radii of curvature of the faces of a double convex lens are 20 cm ...

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  21. A convex lens has 10 cm focal length in air. What is its focal length ...

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