Question

how the size of the image changes as the object distance is changed. At what point are the object and image distances equal? How does the size of the image compare to the object size under these cir- cumstances. Since the virtual image was unable to be projected onto the screen, how are we able to see the virtual image?

Answer 1

Solution) Usually the object distance decreases from large value that is as object moves closer to the lens , the image distance increases and also the image height also increases.

At distance 2F the object distance is equal to image distance and object height is equal to image height .

Under these circumstances , the size of image is greater than size of object .

A virtual image is an image formed when the outgoing rays from a point on an object always diverge . The image appears to be located at point of apparent divergence . Since the rays never really converge a virtual image cannot be projected onto a screen .

But our eyes have convex lens which converges light so we can see the image .