Question

An object placed 50cm from a lens produces a virtual image at a distance of 10cm in front of a lens. What is the focal length of lens?

Answer 1

hey dear here is ur solution___
u=-50
v=-10
1/v-1/u=1/f
1/-10-1/-50=1/f
-5+1/50=1/f
50/-4=f
-12.5=f

Answer 2

here is the solution of your question.

u=-50cm

v=+10cm

f=?

therefore, 1/f=1/v-1/u

=, 1/f=1/10+1/50

= 1/f=5+1/50

=1/f=6/50

=f=50/6

=f=25/3