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Linear Magnification

To obtain a m...

Question

To obtain a magnification of, –0.5 with a convex lens, the object should be placed:
(a) at F
(b) between optical centre and F
(c) between F and 2F
(d) beyond 2F

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Solution

(d) Beyond 2F: since the magnification is negative and less than 1, the image formed is real, inverted and diminished. Therefore, the object should be placed beyond 2F.

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(a) between optical centre and F
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Q. A virtual, erect and magnified image of an object is to be obtained with a convex lens. For this purpose,the object should be placed:

(a) between 2F and infinity
(b) between F and optical centre
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Q. If a magnification of, –1 (minus 1) is obtained by using a converging lens, then the object has to be placed:
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When the object is placed beyond 2F in front of convex lens, the image is formed

Q. A convex lens produces a magnification of + 5. The object is placed:
(a) at focus
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