Question

When a person uses a convex lens to read a dictionary, the dictionary must be placed at a distance 
Less than focal length
More than focal length
More than 2F
Between F and 2F​

Answer 1

When the object is placed at the centre of curvature of a lens then a ray of light AO which is parallel to the principal axis after refraction pmass through the focus F along the direction OF. While the other ray AC pa.ss through the opticl centre C and goes straight without any deviation. These two refracted light rays intersect each other at point A’, on the other side of the lens at the centre of curvature 2F. so, the image A’B’ formed in this case is at the centre of curvature, of same size as the object, real and inverted.

When the object is placed at 2F

Answer 2

Answer:

less than focal length is the right answer I hope so