Question

( 4 ) ) At what distance from a convex lens of focal length f, an object is placed so as to form an image of same size as that of the object?​

Answer 1

Answer:

Same size of image is formed by a convex lens only when the object is placed at a distance u=2f from the optical center and image is also formed at distance 2f on other side of lens.

⟹2f=50

⟹f=25cm

P= 1/f(m)=1/0.25

⟹P=+4D

Explanation:

hope this heplfull

Answer 2

Answer:

the object should be placed at 2F and the image formed is real and inverted .

Hope this is clear