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Q.

Is it true that when the object is placed between the optical centre and principal focus of a convex lens, magnification will be positive?


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a

True

b

False 

answer is A.

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Detailed Solution

The above statement is true.
When an object is placed between one of the two principal foci and the optical centre of a convex lens, a virtual, erect, and enlarged image is formed on the same side of the lens.
Since the image formed is erect, the object and the image would be in the same orientation, i.e. upward of the principal axis.
The height of the image and the object are measured upward on the principal axis. So, they both are positive.
The magnification of a lens is the ratio of the height of an image to that of the object.
Therefore, the magnification, in this case, would be positive.
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