Question

A child reads words of a book with the help of a convex lens keeping it close to book. He finds words enlarged and erect then he gradually withdraws the lens away from the book. At one position the words again become distinctly visible but this time these are enlarged and inverted. Explain this difference with the help of ray diagram for both cases

Answer 1

The image formed in the two cases differs due to image forming properties of convex lenses.

The image formed in the first case is enlarged and erect because the book is at lesser distance than the focal length.

In the second case, the image formed is real because the book is beyond the focal point.

Answer 2

For the enlarged and real image, the lens is placed at the 2 F distance and hence the image formed after the glare will be real and enlarged.

The lens will be kept in the in an upright manner then the virtual image will be formed that will show the inverted form of the object.