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Q.

If an object is placed at a distance 3F from the optic centre of a converging lens of focal length F, then we get: 

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a

Diminished real image between F and 2F.

b

Highly enlarged real image at infinity.

c

An enlarged real image formed at distance greater than 2F.

d

A same-size real image formed at 2F.

answer is B.

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Detailed Solution

  • A convex lens is a converging lens. 
  • When an object is placed at a distance of more than 2F in front of a convex lens then the image is formed between F and 2F on the other side of the lens as shown in the diagram.
  •  As we can see the image is real, inverted and diminished.
Question Image

 

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