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The angle subtended at the eye by an obj...

The angle subtended at the eye by an object is equal to the angle subtended at the eye by the virtual image produced by a magnifying glass. In what sense then does a magnifying glass provide angular magnification ?

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a. Eventhough the absolute image size is bigger than the object size, the angular size of the image is equal to the angular size of he object. The magnifier help in the following way : without it object would be placed no closer than 25 cm , with it the object can be placed is in this sense that angular magnification si achieved.
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NEW JOYTHI PUBLICATION-RAY OPTICS AND OPTICAL INSTRUMENTS -SOLUTIONS TO EXERCISES FROM NCERT TEXT
  1. A person looking at a person wearing a shirt with a pattern comprising...

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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  19. Light incident normally on a plane mirror attached to a galanometer co...

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  20. Figure shows an equiconvex lens (of refractive index 1.50 ) in contact...

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