Question

A convex lens forms a real and inverted image of a needle at a distance of 50cm from it. Where is the needle placed in fronto of this lens if the size of the image is equal to the size of the object? Also find the power of lens

Answer 1

V=50cm u=? P=?

As image formed by lens is real inverted of the same size image at 2F So image at 2F

u=2F=50cm

P=(1/f(m) (100\cm)

P=100/25=4d

Answer 2

Answer:

V=50cm u=? P=?

As image formed by lens is real inverted of the same size image at 2F So image at 2F

u=2F=50cm

P=(1/f(m) (100\cm)

P=100/25=4d

Explanation  like plz