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Stereoscopy & Its Limitations

The eyes of a...

Question

The eyes of an eagle helps to magnify and view an image.

A

False

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B

True

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Solution

The correct option is A False

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Q. A card sheet divided into squares each of size

1 m m^{2}

is being viewed at a distance of

9 c m

through a magnifying glass (a converging lens of focal length

9 c m

) held close to the eye and the magnifying glass if the virtual image of each square is to have an area of

6.25 m m^{2}

. Would you be able to see the squares distinctly with your eyes very close to the magnifier?

Q. What should be the distance between the object in Exercise 9.30 and the magnifying glass if the virtual image of each square in thefigure is to have an area of 6.25 mm2 . Would you be able to see thesquares distinctly with your eyes very close to the magnifier ?[Note: Exercises 9.29 to 9.31 will help you clearly understand thedifference between magnification in absolute size and the angularmagnification (or magnifying power) of an instrument.]

Q. Answer the following questions:

(a )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?

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

(c) Magnifying power of a simple microscope is inversely proportional to the focal length of the lens. What then stops us from using a convex lens of smaller and smaller focal length and achieving greater and greater magnifying power?

(d) Why must both the objective and the eyepiece of a compound microscope have short focal lengths?

(e) When viewing through a compound microscope, our eyes should be positioned not on the eyepiece but a short distance away from it for best viewing. Why? How much should be that short distance between the eye and eyepiece?

Q. Focusing both their eyes on one object helps eagles to:

Fill in the blanks:

In our eyes an image of objects we wish to view is made at the _________ .

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