Question

the image of an object formed by a convex lens is of the same size as that of the object if the image is formed at a distance of 50 cm from the lens at what distance from the lens is the object placed find the focal length and the power of the lens used​

Answer 1

Answer:

f = 25cm

Explanation:

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=f(m)1=0.251

⟹P=+4D