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Question

Where should an object be placed in front of convex lens to get a real image of the size of the object?


A
At the principal focus of the lens
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B
At twice the focal length
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C
At infinity
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D
Between the optical centre of the lens and its principal focus
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Solution

The correct option is B At twice the focal length
When object is kept at twice the focal length, image is formed at twice the focal length on the opposite side. In such a scenario, magnification is -1 and hence the image size is same as object size.

Science
NCERT
Standard X

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