Question

A convex lens forms a real image of a
point object at a distance of 50 cm from
the convex lens. A concave lens is
placed 10 cm behind the convex lens
on the image side. On placing a plane
mirror on the image side and facing
the concave lens, it is observed that
the final image now coincides with the
object itself. The focal length of the
concave lens is:
1) 50cm
2) 20cm
31 40cm
4) 25cm​

Answer 1

Answer:

Explanation:

40 cm is the answer mark me brainliest