Two point objects are placed on principal axis of a thin converging lens. One is $$20$$ cm from the lens and other is on the other side of lens at a distance of $$40$$ cm from the lens. The images of both objects coincide. The magnitude of focal length of lens is

Question

Infinity Learn · Accepted Answer

for object $$O1$$ image is virtual i.e. on the same side of  the $$object-1v+120=1f$$                                        ......$$(1)for$$ object $$O2$$ image is real $$1v+140=$$−$$1f$$                        .......$$(2)from$$ equation $$1$$ and $$2$$ we get  f $$=$$ $$80/3$$.

Two point objects are placed on principal axis of a thin converging lens. One is 20 cm from the lens and other is on the other side of lens at a distance of 40 cm from the lens. The images of both objects coincide. The magnitude of focal length of lens is

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