Question

On keeping ,
object at a distance
of 30cm
from a
an object
concave luns, the formect sire of an
conc
g
2
image is
focal
of the size the object. Find the
length of uns.​

Answer 1

concave lens produces a virtual, erect diminished image.

Using Real Is Positive RIP Convention, u=30 and f=-15

1/u+1/v=1/f

1/30+1/v=−1/15

1/v=−1/15−1/30=−3/30=−1/10

v=−10M=v/u=−1/3

So image is erect, virtual, 1/3 size of object, and 10 cm from the lens, (between lens and object)