At what position does a magnifying glass is kept to manify the object?

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Solution

A magnifying glass is a convex lens.
Suppose both the surfaces of the lens has focal length F.
Therefore to magnify the object, the position should be such that the object is between F and 2F from the lens.
Also if the object is placed between optical center O and focus F, the image obtained is enlarged.

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Similar questions

Q. At what position of the object does a convex lens act as a magnifying glass?

(a) between F and 2F
(b) between F and O
(c) beyond F
(d) beyond 2F

Q. If the focal length of a magnifying glass is 2.5 cm, it can magnify an object

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 one’s 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. A convex lens works as a magnifying glass when the object is kept

(a) very far away
(b) at the focus
(c) between the lens and focus
(d) beyond the focus

Q. A magnifying glass or a simple microscope is used to form a magnified virtual image of a tiny object. Which of the following is the most suitable for this?

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