Images formed by convex lens

Question 1 Where should an object be placed in front of a convex lens so as to obtain image on same side of lens?

Question 2 The image formed by convex lens is seen to be real,inverted and diminished.What is the position of the object?

Question 3 The image formed by convex lens is seen to be real,inverted and highly magnified.What is the position of the object?

Image formation in lenses using ray diagram

1)A ray parallel to principal axis

A ray of light travelling parallel to principal axis passes or appears to pass through focus after passing through lens.


2)A ray passing through principal focus

A ray of light passing through focus or directed towards it,travel parallel to principal axis after passing through the lens.


3)A ray passing through optical centre of the lens

A ray passing through optical centre travels undeviated after passing through lens.


Images formed by convex lens

Object is at infinity

object is at infinity


1)Image is formed at second principal focus F2

2)It is diminished,real and inverted.


Object is beyond 2F1

Object is beyond 2F1

1)Image is formed between F2 and 2 F2

2)It is diminished,real and inverted.


Object is at 2F1

Object is at 2F1
1)Image is formed at 2F2

2)Image is of same size as that of object.

3)It is real,inverted.


Object is between Fand 2F1

Object is between F1 and 2F1
1)Image is formed beyond 2F2

2)It is larger in size than object.

3)It is real,inverted.


Object is at F1

Object is at F1
1)Image is formed at infinity.

2)It is highly magnified,real,inverted.


Object is between Fand optical centre of lens

Object is between F1 and optical centre of lens
1)Image is formed on same side of lens as that of object.

2)It is larger in size than object.

3)It is virtual and erect.

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