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Answer the following questions: (b) In...

Answer the following questions:
(b) In viewing through a magnifying glass, one usually positions one’s eyes very close to the lens. Does angular magnification change if the eye is moved back?

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Yes, angular magnification will decreases Because, angle subtended eye is less than that with lens. If image is obtained at very large distance, than this effect can be neglected. (Note : When eye is away from lens then angles subtended by first object and its image with eye are not same.
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KUMAR PRAKASHAN-RAY OPTICS AND OPTICAL INSTRUMENTS-SECTION-B (NUMERICALS)(NUMERICAL FROM TEXTUAL EXERCISE)
  1. An object 1.5 cm in size is placed on the side of the convex lens in t...

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  2. At what angle should a ray of light be incident on the face of a prism...

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  3. A card sheet divided into squares each of size 1 mm^(2) is being viewe...

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  4. (a) At what distance should the lens be held from the figure in Exerci...

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  5. What is the magnification in this case ?

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  6. (a) At what distance should the lens be held from the figure in Exerci...

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  7. What should be the distance between the object in Exercise 9.24 and th...

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  8. Answer the following questions: (a) The angle subtended at the eye b...

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  9. Answer the following questions: (b) In viewing through a magnifying ...

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  10. Answer the following questions: (c) Magnifying power of a simple mic...

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  11. Answer the following questions: (d) Why must both the objective and ...

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  12. Answer the following questions: (e) When viewing through a compound ...

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  13. An angular magnification (magnifying power) of 30X is desired using an...

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

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  15. For the telescope described in Exercise 9.3 (a), what is the separatio...

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  16. If this telescope is used to view a 100 m tall tower 3 km away, what i...

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  17. (a) For the telescope described in Exercise 9.28 (a), what is the sepa...

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  18. A Cassegrain telescope uses two mirrors as shown in Fig. 9.30. Such a ...

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  19. Light incident normally on a plane mirror attached to a galvanometer c...

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

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