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A person looking at a person wearing a s...

A person looking at a person wearing a shirt with a pattern comprising vertical and hoziontal lines is able to see the vertical lines more distinclty than the horizontal ones. What is this defect due to ? How is such a defect of vision corrected?

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Astigmatism. This defect is removed by using cylindrical lens with vertical axis.
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NEW JOYTHI PUBLICATION-RAY OPTICS AND OPTICAL INSTRUMENTS -SOLUTIONS TO EXERCISES FROM NCERT TEXT
  1. For a normal eye, the far point is at infinity and the near point of d...

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  2. A myopic person has been using spectacles of power -1.0 dioptre for di...

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  3. A person looking at a person wearing a shirt with a pattern comprising...

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  4. A man with normal near point (25 cm ) reads a book with small print us...

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  5. A card sheet divided into squares each of size 1 mm^(3) viewed at a ...

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  6. a. At what distance should the lens be held in Exercise 27 in order t...

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  7. If the object is at (50/7)cm and the image produced is at distinct vis...

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  8. Is the magnification equal to the magnifying power in this case ? Expl...

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  9. What should be the distance between the object in Exercise 28 and the ...

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  10. The angle subtended at the eye by an object is equal to the angle subt...

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  11. In viewing through a magnifying glass, one usually positions one's eye...

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  12. Magnifying power of a simple microscope is inversely proportional to t...

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  13. Why must both the objective and the eyepiece of a compound microscope...

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  14. When viewing through a compound microscope, our eyes should be positio...

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  15. An angular magnification (magnifying power ) of 30x is desired using o...

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  16. A small telescope has an objective lens of focal length 140 cm and eye...

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  17. For the telescope described in Exercise 32 (a ) , whet is the separati...

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  18. Focal length of the Objective lens is 140 cm. Focal length of the eyep...

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  19. A height of a tower formed by a objective lens of a telescope is 4.7 c...

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  20. A Cassegrain telescope uses two mirrors. Such a telescope is bult with...

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