Question

It is desired to obtain an erect image of an object, using convex
lens of focal length of 12 cm.
a. What should be the range of the object distance in the above
case?
b. Will the image be smaller or larger than the object? Draw a
ray diagram to show the formation of image in this case.
Where will the image of this object be, if it is placed 24 cm
in front of the lens?​

Answer 1

a. between optical centre and focus.

b. magnified (larger)

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Answer 2

a.

So the object must be placed anywhere between 0 to 12 centimeter.

b.

The image formed will be virtual erect and magnified than the object.

c.

When the object is at 24 cm which is 2f from the lens then the image will also be at 24 cm real inverted and of same size as the object.

Step-by-step explanation:

The focal length of the convex lens, $f=12\ cm$

To obtain an erect image of the object we know that the object must be placed between the optical center and the focus of  a convex lens.

a.

So the object must be placed anywhere between 0 to 12 centimeter.

b.

The image formed will be virtual erect and magnified than the object.

c.

When the object is at 24 cm which is 2f from the lens then the image will also be at 24 cm real inverted and of same size as the object.