Q30 of 51 Page 345

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

Magnifying power = d/u


= 25/7.14


= 3.5


Therefore, the magnifying power is equal to the magnitude of magnification since the image is formed at the near point (25 cm).


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30

At what distance should the lens be held from the figure in Exercise 9.29 in order to view the squares distinctly with the maximum possible magnifying power?

 30

What is the magnification in this case?

 31

What should be the distance between the object in Exercise 9.30 and the magnifying glass if the virtual image of each square in the figure is to have an area of 6.25 mm2. Would you be able to see the squares distinctly with your eyes very close to the magnifier?

 32

Answer the following question:

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?