Question

A convex lens forms an erect and two times magnified image of an object placed at a distance 10cm in front of it.Find the position of the image.

please ans fast !!!!​

Answer 1

Answer:

Answer:

A) the object is placed between f1and optic center

. b) the focal length could be found through lens formulae as magnification is +3.

+3u=v

1/f=1/v-1/u

=1/3u-1/u

=(1-3)/3u

=-2/3*-20(u =-20)

=f=15cm